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F3165 Sigma-Aldrich

Monoclonal ANTI-FLAG® M2 antibody produced in mouse

clone M2, purified immunoglobulin (Purified IgG1 subclass), buffered aqueous solution (10 mM sodium phosphate, 150 mM NaCl, pH 7.4, containing 0.02% sodium azide)

Synonym: Anti-ddddk, Anti-dykddddk

  •  NACRES NA.32



Related Categories Alphabetical Index, Antibodies, Antibodies and Conjugates, Antibodies to Peptide and Protein Fusion Tags, FK-FO,
conjugate   unconjugated
clone   M2, monoclonal
biological source   mouse
application(s)   western blot: 10 μg/mL (Protein A)
species reactivity   all
form   buffered aqueous solution (10 mM sodium phosphate, 150 mM NaCl, pH 7.4, containing 0.02% sodium azide)
shipped in   dry ice
storage temp.   −20°C
antibody form   purified immunoglobulin (Purified IgG1 subclass)
isotype   IgG1
Quality Level   200
antibody product type   primary antibodies
purified by   using Protein A
concentration   3.8-4.2 mg/mL
immunogen sequence   DYKDDDDK


General description

Anti Flag M2 antibody is used for the detection of Flag fusion proteins.This monoclonal antibody is produced in mouse and recognizes the FLAG sequence at the N-terminus, Met N-terminus, and C-terminus. The antibody is also able to recognize FLAG at an internal site. M2, unlike M1 antibody is not Calcium dependent.
F1804 is an affinity purified, FLAG M2 antibody, increasing sensitivity in most applications.
Method of purification - Protein A


FLAG; peptide sequence DYKDDDDK


Monoclonal ANTI-FLAG® M2 antibody produced in mouse has been used in:
• immunoblotting
• immunoprecipitation
• immunocytochemistry
• immunofluorescence
• chromatin immunoprecipitation
• electron microscopy
• flow cytometry
• supershift assays

Browse additional application references in our FLAG® Literature portal.

Storage and Stability

Store the undiluted antibody at –20 °C in working aliquots. Repeated freezing and thawing is not recommended.
Note: Overtime, small amounts of purified antibodies can precipitate from solution due to intermolecular hydrophobic interactions. If a precipitate is observed in this product, briefly centrifuge the vial to pellet the precipitate. Withdraw the desired volume of antibody solution from the clear supernatant for use. This should not alter the performance of the purified antibody in Western blot or immunoprecipitation applications.

Legal Information

ANTI-FLAG is a registered trademark of Sigma-Aldrich Co. LLC

FLAG is a registered trademark of Sigma-Aldrich Co. LLC


5 mg in poly bottle

Preparation Note

Dilute the antibody solution from 0.5-10 ug/mL in Tris Buffered Saline, pH 8.0, with 3% nonfat milk

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable
Protocols & Articles


Anti-FLAG® M2 Magnetic Beads

Anti-FLAG® M2 magnetic beads provide an easy, fast and convenient method for the detection and capture of fusion proteins with the FLAG® peptide sequence. Beads are composed of a murine derived, anti...

Antibody Basics

Immunoglobulins (Igs) are produced by B lymphocytes and secreted into plasma. The Ig molecule in monomeric form is a glycoprotein with a molecular weight of approximately 150 kDa that is shaped more ...
Keywords: Affinity chromatography, Centrifugation, Chromatography, Digestions, Direct immunofluorescence, Gene expression, High performance liquid chromatography, Immunofluorescence, Ion Exchange, Microscopy, Precipitation, Purification, Rheumatology, Scanning electron microscopy

Inhibition of Autoregulated TFG-ß

We studied autocrine transforming growth factor (TGF)beta signaling in kidney epithelium. Cultured proximal tubule cells showed regulated signaling that was high during log-phase growth, low during c...
Keywords: Growth factors

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FLAG System Using three monoclonal ANTI-FLAG antibodies

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Peer-Reviewed Papers


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