pierce EMSA 试剂盒说明书

INSTRUCTIONS

LightShift Chemiluminescent

EMSA Kit

20148

Number

20148

®

Description

0919.7

LightShift Chemiluminescent EMSA Kit, contains components for 100 binding reactions and

sufficient detection reagents for approximately 1000cm

2

of membrane

Kit Contents:

LightShift EMSA Optimization and Control Kit (20148X):

10X Binding Buffer, 1mL, 100mM Tris, 500mM KCl, 10mM DTT; pH 7.5, store at -20°C

Biotin–EBNA Control DNA, 50μL, 10fmol/μL in 10mM Tris, 1mM EDTA; pH 7.5, store at -20°C

The 60 bp biotin end-labeled duplex contains the following binding site:

5' BIOTIN-…TAGCATATGCTA…-3'

3'-…ATCGTATACGAT…-BIOTIN 5'

Unlabeled EBNA DNA, 50μL, 2pmol/μL in 10mM Tris, 1mM EDTA; pH 7.5, store at -20°C

The ~25 bp duplex contains the following binding site:

5'-…TAGCATATGCTA…-3'

3'-…ATCGTATACGAT…-5'

Epstein-Barr Nuclear Antigen (EBNA) Extract, 125μL, store at -20°C

Poly (dI•dC), 125μL, 1µg/μL in 10mM Tris, 1mM EDTA; pH 7.5, store at -20°C

50% Glycerol, 500μL, store at -20°C

1% NP-40, 500μL, store at -20°C

1 M KCl, 1mL, store at -20°C

100mM MgCl

2

, 500μL, store at -20°C

200mM EDTA pH 8.0, 500μL, store at -20°C

5X Loading Buffer, 1mL, store at -20°C

Chemiluminescent Nucleic Acid Detection Module (89880):

Stabilized Streptavidin-Horseradish Peroxidase Conjugate, 1.5mL, store at 4°C

Chemiluminescent Substrate, stable for 6 months at room temperature or 1 year at 4°C

Luminol/Enhancer Solution, 80mL

Stable Peroxide Solution, 80mL

Blocking Buffer, 500mL, store at 4°C

4X Wash Buffer, 500mL, store at 4°C

Substrate Equilibration Buffer, 500mL, store at room temperature or 4°C

Storage: Upon receipt store individual components as indicated above. Box 20148X is shipped with

dry ice. Box 89880 is shipped with an ice pack.

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PO Box 117

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(815) 968-0747

(815) 968-7316 fax

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Table of Contents

Introduction ................................................................................................................................................................................. 2

Procedure for Electrophoretic Mobility Shift Assay (EMSA) ..................................................................................................... 3

A. Plan Binding Reactions .................................................................................................................................................... 3

B. Prepare and Pre-Run Gel ................................................................................................................................................. 4

C. Prepare and Perform Binding Reactions .......................................................................................................................... 5

D. Electrophorese Binding Reactions ................................................................................................................................... 5

E. Electrophoretic Transfer of Binding Reactions to Nylon Membrane .............................................................................. 5

F. Crosslink Transferred DNA to Membrane ....................................................................................................................... 5

G. Detect Biotin-labeled DNA by Chemiluminescence ....................................................................................................... 6

Additional Information Available from the Pierce Web Site ....................................................................................................... 6

Troubleshooting ........................................................................................................................................................................... 7

Related Thermo Scientific Products ............................................................................................................................................ 7

References ................................................................................................................................................................................... 8

Introduction

The electrophoretic mobility shift assay (EMSA) has been used extensively for studying DNA-protein interactions.

1-3

This

technique is based on the fact that DNA-protein complexes migrate slower than non-bound DNA in a native polyacrylamide

or agarose gel, resulting in a “shift” in migration of the labeled DNA band.

The Thermo Scientific LightShift Chemiluminescent EMSA Kit uses a nonisotopic method to detect DNA-protein

interactions. Biotin end-labeled DNA containing the binding site of interest is incubated with a nuclear extract or purified

factor. This reaction is then subjected to gel electrophoresis on a native polyacrylamide gel and transferred to a nylon

membrane. The biotin end-labeled DNA is detected using the Streptavidin-Horseradish Peroxidase Conjugate and the

Chemiluminescent Substrate.

Additional Materials Required

• Biotin 3' or 5' end-labeled DNA target. Use existing end-biotinylated DNA targets or prepare them using a biotin end-

labeling kit (see Related Thermo Scientific Products). Do not use probes with internal biotin labels (i.e., targets

biotinylated at sites other than the 3' or 5' end, such results from random prime labeling methods) because the internal

labels may inhibit binding of the DNA binding protein.

Positively charged nylon membrane (see Related Thermo Scientific Products)

5X TBE (450mM Tris, 450mM boric acid, 10mM EDTA, pH 8.3)

X-ray film (see Related Thermo Scientific Products) or CCD camera

UV lamp or crosslinking device equipped with 254nm bulbs or 312nm transilluminator

Electrophoresis apparatus

Electroblotter or capillary transfer apparatus

High-quality blotting paper

Circulating water bath

Plastic forceps

Polyacrylamide gel in 0.5X TBE

•

•

•

•

•

•

•

•

•

•

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2

Procedure for Electrophoretic Mobility Shift Assay (EMSA)

This kit has been optimized for use with polyacrylamide mini (8 × 8 × 0.1cm) gels. For larger gels, adjust electrophoresis

conditions and detection reagent volumes accordingly.

A. Plan Binding Reactions

• Understanding the Control EBNA System

Include a complete set of three reactions each time an EMSA is performed. These reactions and expected results for the

Control Epstein-Barr nuclear antigen (EBNA) System, which is included with the kit, are described in Table 1.

Table 1. Description of control reactions and expected results.

Reaction Contents of Reaction Description

#1 Biotin-EBNA Control DNA

No protein extract for DNA to bind;

therefore, no shift is observed. Establishes

the position of an unshifted probe band.

Contains sufficient target protein to effect

binding and shift of the Biotin-EBNA DNA.

Shift detected by comparison to band

position in #1.

Demonstrates that the signal shift observed

in #2 can be prevented by competition from

excess non-labeled DNA, i.e., the shift

results from specific protein:DNA

interaction.

Result

#1 #2 #3

#2

Biotin-EBNA Control DNA +

EBNA extract

Biotin-EBNA Control DNA +

#3

EBNA extract +

200-fold molar excess of

unlabeled EBNA DNA

The Control EBNA System results reported in Table 1 were generated using binding reactions prepared according to Table 2.

Each 20μLbinding reaction contains 20 fmol of Biotin-EBNA Control DNA. Reactions were electrophoresed, transferred and

detected according to the steps in Sections B-G of this protocol. If the kit is being used for the first time, perform the Control

EBNA System reactions to verify that the kit components and overall procedure are working properly.

Table 2. Binding reactions for Control EBNA System.

Component

Ultrapure Water

10X Binding Buffer (20148A)

50% Glycerol (20148F)

100mM MgCl

2

(20148I)

1µg/μL Poly (dI•dC) (20148E)

1% NP-40 (20148G)

Unlabeled EBNA DNA (20148C)

EBNA Extract (20148D)

Biotin–EBNA Control DNA (20148B)

Total Volume

Final Amount

----

1X

2.5%

5mM

50 ng/µL

0.05%

4 pmol

1 Unit

20 fmol

----

Control Reactions

#1

12μL

2μL

1μL

1μL

1μL

1μL

-----

-----

2μL

20μL

#2

11μL

2μL

1μL

1μL

1μL

1μL

-----

1μL

2μL

20μL

#3

9μL

2μL

1μL

1μL

1μL

1μL

2μL

1μL

2μL

20μL

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3

• Planning and optimizing the Test System

As with the Control EBNA System, a complete set of three reactions should be performed with the Test System. Use Table 3

as a guide for planning the Test System binding reactions. If specific binding conditions are not already known, use only

minimal reaction components; e.g., 10X binding buffer and Poly (dΙ•dC), together with the biotin-labeled target DNA,

protein extract and unlabeled DNA of the Test System.

Nuclear protein extracts prepared using the Thermo Scientific NE-PER

Nuclear and Cytoplasmic Extraction Reagents (see

Related Thermo Scientific Products) are an excellent source of target protein. Use 2-3μL of NE-PER

®

Nuclear Extract per

20μL binding reaction. If a greater volume of NE-PER Extract is required, remove excess salts in the extract by dialyzing

into a buffer containing 200mM salt (use a Slide-A-Lyzer

®

MINI Dialysis Unit; see Related Thermo Scientific Products)

before use in the LightShift

EMSA Kit.

Optimization of the Test System can be achieved by adding other components supplied in the kit such as KCl,

4, 5

glycerol,

MgCl

2

4, 6

and detergent

7, 8

and determining their effects on the shift. Bovine serum albumin and basic peptides have also been

shown to enhance some DNA-protein interactions.

8-10

Too much glycerol in the binding reactions may cause vertical streaks

along the edges of the lanes.

Poly (dI•dC), which is included in the kit, is the nonspecific competitor DNA of choice for most systems. However if the Test

System target DNA sequence is GC-rich, try Poly (dA•dT), sonicated calf thymus, salmon sperm or Escherichia coli DNA.

The order of addition of the nuclear extract and biotin-labeled target DNA may affect the specificity of the DNA-protein

complexes. Always add the binding reaction components in the order listed in Table 3. To overcome strong nonspecific

interactions, a short pre-incubation may be required before adding the biotin-labeled target DNA.

Table 3. Binding reactions for the Test System.

Component

Ultrapure Water

10X Binding Buffer (20148A)

1µg/μL Poly (dI•dC) (20148E)

Optional: 50% Glycerol (20148F)

Optional: 1% NP-40 (20148G)

Optional: 1M KCl (20148H)

Optional: 100mM MgCl

2

(20148I)

Optional: 200mM EDTA (20148J)

Unlabeled Target DNA

Protein Extract (

e.g., 2-3μLNE-PER Reagent extract

)

Biotin End-Labeled Target DNA

Total Volume

B. Prepare and Pre-Run Gel

1. Prepare a native polyacrylamide gel in 0.5X TBE or use a pre-cast DNA retardation gel. The appropriate polyacrylamide

percent depends on the size of the target DNA and the binding protein. Most systems use a 4 -6% polyacrylamide gel in

0.5X TBE.

2. Place the gel in the electrophoresis unit, and clamp it to obtain a seal. Fill the inner chamber with 0.5X TBE to a height

several millimeters above the top of the wells. Fill the outside of the tank with 0.5X TBE to just above the bottom of the

wells, which reduces heat during electrophoresis. Flush wells and pre-electrophorese the gel for 30-60 minutes. Apply

100V for an 8 × 8 × 0.1cm gel.

3. Proceed to Section C while gel is pre-electophoresing.

Final Amount

-----

1X

50ng/μL

4pmol

system-dependent

20fmol

----

Reaction

#1

2μL

1μL

-----

-----

20μL

#2

2μL

1μL

-----

20μL

#3

2μL

1μL

20μL

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4

C. Prepare and Perform Binding Reactions

Notes:

•

•

Include controls in the assay to ensure the system is working properly (see Procedure, Section A).

Do not vortex the Control DNA or the EBNA extract.

1. Thaw all binding reaction components, EBNA Control System components and Test System samples, and place them on

ice. Do not thaw the EBNA Extract until immediately before use. Thaw the EBNA Extract at room temperature. DO

NOT heat the EBNA Extract, which includes thawing in your hand.

2. Prepare complete sets of 20 binding reactions for the Control EBNA System and/or the Test System according to

Procedure Section A, Tables 2 and 3; add the reagents in the order listed in the tables. Do not vortex tubes at any time

during this procedure.

3. Incubate binding reactions at room temperature for 20 minutes.

4. Add 5µL of 5X Loading Buffer to each 20µL binding reaction, pipetting up and down several times to mix. DO NOT

vortex or mix vigorously.

D. Electrophorese Binding Reactions

1. Switch off current to the electrophoresis gel.

2. Flush the wells and then load 20μL of each sample onto the polyacrylamide gel.

3. Switch on current (set to 100V for 8 × 8 × 0.1cm gel) and electrophorese samples until the bromophenol blue dye has

migrated approximately 2/3 to 3/4 down the length of the gel. The free biotin-EBNA Control DNA duplex migrates just

behind the bromophenol blue in a 6% polyacrylamide gel.

E. Electrophoretic Transfer of Binding Reactions to Nylon Membrane

1. Soak nylon membrane in 0.5X TBE for at least 10 minutes.

2. Sandwich the gel, nylon membrane and blotting paper in a clean electrophoretic transfer unit according the

manufacturer’s instructions. Use 0.5X TBE cooled to ~10ºC with a circulating water bath. Use very clean forceps and

powder-free gloves, and handle the membrane only at the corners.

Note: Use clean transfer sponges. Avoid using sponges that have been used in Western blots.

3. Transfer at 380mA (~100V) for 30 minutes. Typical transfer times are 30-60 minutes at 380mA using a standard tank

transfer apparatus for mini gels (8 × 8 × 0.1cm).

4. When the transfer is complete, place the membrane with the bromophenol blue side up on a dry paper towel. (There

should be no dye remaining in the gel.) Allow buffer on the membrane surface to absorb into the membrane. This will

only take a minute. Do not let the membrane dry. Immediately proceed to Section F.

F. Crosslink Transferred DNA to Membrane

Three options are available for crosslinking:

•

•

•

Option 1: Crosslink at 120mJ/cm

2

using a commercial UV-light crosslinking instrument equipped with 254nm bulbs

(45-60 second exposure using the auto crosslink function).

Option 2: Crosslink at a distance of approximately 0.5 cm from the membrane for 5-10 minutes with a hand-held UV

lamp equipped with 254nm bulbs.

Option 3: Crosslink for 10-15 minutes with the membrane face down on a transilluminator equipped with 312nm bulbs.

After the membrane is crosslinked, proceed directly to Section G. Alternatively, the membrane may be stored dry at room

temperature for several days. Do not allow the membrane to get wet again until ready to proceed with Section G.

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5

G. Detect Biotin-labeled DNA by Chemiluminescence

The recommended volumes are for an 8 × 10cm membrane. If larger gels are used, adjust volumes in Section G accordingly.

Perform all blocking and detection incubations in clean trays or in plastic weigh boats on an orbital shaker.

1. Gently warm the Blocking Buffer and the 4X Wash Buffer to 37-50°C in a water bath until all particulate is dissolved.

These buffers may be used between room temperature and 50°C as long as all particulate remains in solution. The

Substrate Equilibration Buffer may be used between 4°C and room temperature.

2. To block the membrane add 20mL of Blocking Buffer and incubate for 15 minutes with gentle shaking.

3. Prepare conjugate/blocking buffer solution by adding 66.7μL Stabilized Streptavidin-Horseradish Peroxidase Conjugate

to 20mL Blocking Buffer (1:300 dilution).

Note: This conjugate/blocking buffer solution has been optimized for the Nucleic Acid Detection Module and should not

be modified.

4. Decant blocking buffer from the membrane and replace it with the conjugate/blocking solution. Incubate membrane in

the conjugate/blocking buffer solution for 15 minutes with gentle shaking.

5. Prepare 1X wash solution by adding 40mL of 4X Wash Buffer to 120mL of ultrapure

water.

6. Transfer membrane to a new container and rinse it briefly with 20mL of 1X wash solution.

7. Wash membrane four times for 5 minutes each in 20mL of 1X wash solution with gentle shaking.

8. Transfer membrane to a new container and add 30mL of Substrate Equilibration Buffer. Incubate membrane for

5 minutes with gentle shaking.

9. Prepare Substrate Working Solution by adding 6mL Luminol/Enhancer Solution to 6mL Stable Peroxide Solution.

Note: Exposure to the sun or any intense light can harm the Working Solution. Keep the Working Solution in an amber

bottle and avoid prolonged exposure to intense light. Short-term exposure to typical laboratory lighting will not harm the

Working Solution.

10. Remove membrane from the Substrate Equilibration Buffer, carefully blotting an edge of the membrane on a paper towel

to remove excess buffer. Place membrane in a clean container or onto a clean sheet of plastic wrap placed on a flat

surface.

11. Pour the Substrate Working Solution onto the membrane so that it completely covers the surface. Alternatively, the

membrane may be placed DNA side down onto a puddle of the Working Solution. Incubate membrane in the substrate

solution for 5 minutes without shaking.

12. Remove membrane from the Working Solution and blot an edge of the membrane on a paper towel for 2-5 seconds to

remove excess buffer. Do not allow the membrane to become dry.

13. Wrap the moist membrane in plastic wrap, avoiding bubbles and wrinkles.

14. Expose membrane to an appropriately equipped CCD camera, or place the membrane in a film cassette and expose to

X-ray film for 2-5 minutes. Develop the film according to manufacturer’s instructions. Exposure time may be adjusted to

obtain the desired signal.

Additional Information Available from our Website

•

•

Tech Tip: Anneal complementary pairs of oligonucleotides

Frequently Asked Questions (FAQ) for the LightShift Chemiluminescent EMSA Kit

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3747 N. Meridian Road

PO Box 117

Rockford, lL 61105 USA

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6

Troubleshooting

Problem

High background

Cause

Particulate in Blocking Buffer or Wash

Buffer

Contaminants in the TBE

The transfer unit or sponges used were dirty

Speckling/spots Precipitate in HRP conjugate

Air bubbles

No bands detected/low

signal

Used target DNA without a biotin label

Not enough biotin target DNA used

Target DNA degraded

Poor transfer to membrane

Wrong type of membrane used

Blot dried out during detection steps

Did not crosslink/poor crosslinking

4X wash buffer not diluted to 1X

Insufficient film exposure

Disrupted the complex by vortex mixing or

heating

Not enough extract

Extract degraded

System not optimized

Did not use nonspecific competitor DNA

Solution

Gently warm until no particulate remains

Use high-quality reagents or filter TBE through

a 0.2µm filter before use

Use clean equipment and sponges that were not

previously used for Western blotting

Filter the conjugate through a 0.2µm filter or

centrifuge 1 minute at maximum speed

Eliminate bubbles between gel and membrane

before transfer

Use target DNA with end-labeled biotin

Increase target DNA concentration

Check integrity of target DNA

Check transfer protocol

Biodyne

®

B positively charged nylon

membrane (see Related Thermo Scientific

Products)

Cover membrane completely during

incubations

Check efficiency of crosslinker

Dilute 4X wash buffer to 1X

Increase exposure time

Try running the gel with cold buffer

Use more extract

Try using protease inhibitors

Determine effects of additives on the system;

12

for example: KCl, glycerol, NP-40, Mg

2+

, Zn

2+

Use a nonspecific competitor DNA such as

Poly (dI•dC)

No shift detected

All DNA shifted to top

of gel

Related Thermo Scientific Products

89818

78833

77016

34090

21065

69550

89880

20158

Biotin 3' End DNA Labeling Kit, components for 20 labeling reactions

NE-PER Nuclear and Cytoplasmic Extraction Reagents

Biodyne B Nylon Membrane, 8cm × 12cm, 0.4µm pore size, 25 sheets per package

CL-Xposure™ Film (5” × 7” sheets), 100 sheets per package

Pierce

®

Background Eliminator Kit, for eliminating background from X-ray film

Slide-A-Lyzer MINI Dialysis Unit, 10-100µL capacity, 3.5K MWCO, 50 per package

Chemiluminescent Nucleic Acid Detection Module

LightShift Chemiluminescent RNA EMSA (REMSA) Kit

Pierce Biotechnology

3747 N. Meridian Road

PO Box 117

Rockford, lL 61105 USA

(815) 968-0747

(815) 968-7316 fax

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7

Cited References

Fried, M. and Crothers, D.M. (1981). Equilibria and kinetics of lac repressor-operator interactions by polyacylamide gel electrophoresis. Nucl. Acids

Res. 9:6505-25.

2. Revzin, A. (1989). Gel electrophoresis assays for DNA-protein interactions. BioTechniques 7:346-54.

3. Hendrickson, W. (1985). Protein-DNA interactions studied by the gel electrophoresis-DNA binding assay. BioTechniques 3:198-207.

4. Winston, R.L., et al. (1999). Characterization of the DNA binding properties of the bHLH domain of deadpan to single and tandem sites. Biochemistry

38:5138-46.

5. Triplett, B. (1992). Salt-dependent formation of DNA-protein complexes in vitro, as viewed by the gel mobility shift assay. BioTechniques 13:354-5.

6. Szczelkun, M.D. and Connolly, B.A. (1995). Sequence-specific binding of DNA by the EcoRV restriction and modification enzymes with nucleic acid

and cofactor analogues. Biochemistry 34:10724-33.

7. Hodgson, J. and Enrietto, P.J. (1995). Constitutive and inducible kappa B binding activities in the cytosol of v-Rel-transformed lymphoid cells. J.

Virol. 69:1971-9.

8. Zhang, X.Y., et al. (1992). Increasing the activity of affinity-purified DNA binding proteins by adding high concentrations of nonspecific proteins.

Anal. Biochem. 201:366-74.

9. Kozmik, Z., et al. (1990). Albumin improves formation and detection of some specific protein-DNA complexes in the mobility shift assay. Nucl. Acids

Res. 18:2198.

10. Bannister, A. and Kouzarides, T. (1992). Basic peptides enhance protein-DNA interaction in vitro. Nucl. Acids Res. 20:3523.

11. Sambrook, J., et al. (1989). Molecular Cloning: A Laboratory Manual, 2

nd

ed. Cold Spring Harbor Laboratory Press.

12. Kironmai, K.M., et al. (1998). DNA-binding activities of Hop1 protein, a synaptonemal complex component from Saccharomyces cerevisiae. Mol.

Cell Biol. 18:1424-35.

1.

Product References

Cornelussen, R.N.M., et al. (2001). Regulation of prostaglandin A

1

-induced heat shock protein expression in isolated cardiomyocytes. J. Mol. Cell Cardiol.

33:1447-54.

Ishida, A., et al. (2002). Transforming growth factor-β induces expression of receptor activator of NF-κB ligand in vascular endothelial cells derived from

bone. J. Biol. Chem. 277(29):26217-24.

MacLachlan, T.K. and El-Deiry, W.S. (2002). Apoptotic threshold is lowered by p53 transactivation of caspase-6. PNAS. 99(14):9492-7.

Matata, B.M. and Galinanes, M. (2002). Peroxynitrite is an essential component of cytokines production mechanism in human monocytes through

modulation of nuclear factor-κB DNA binding activity. J. Biol. Chem. 277(3):2330-5.

Sauzeau, V., et al. (2003). RhoA expression is controlled by nitric oxide through cGMP-dependent protein kinase activation. J. Biol. Chem. 278(11):9472-

80.

Tarumi, T., et al. (2002). Cloning and characterization of the human factor XI gene promoter. J. Biol. Chem. 277(21):18510-16.

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PO Box 117

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(815) 968-7316 fax

/pierce

8