5-Methylcytosine (5-mC) antibody (mAb)

RRID: AB_2687950
Clone: 33D3
Catalog No: 39649 Format: 50 µg $260 Buy

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Antibody Type:
Protein A Chromatography
Human, Not Species Specific


Methyl-DNA Immunoprecipitation Validated Immunohistochemistry Validated Enzyme-linked Immunosorbent Assay Validated

Application Notes

Validated Applications:
MeDIP: 1 µg per IP
IHC (FFPE): 1:1000
ELISA: 1:10,000 dilution

For 5-methylcytosine, we also offer AbFlex® 5-methylcytosine Recombinant Antibody (rAb).  For details, see Catalog No. 91187.

Published Applications

The following applications have been published using this antibody. Unless noted above, Active Motif may not have validated the antibody for use in these applications:

Flow Cytometry

View publications that use Active Motif products & services here. Enter the product number(s) to see publications & applications that use this antibody.


Clone 33D3 recognizes the modified base 5-methylcytidine found in plant and vertebrate DNA.


Purified IgG in PBS (pH 7.4).


5-Methylcytosine (5-mC) antibody (mAb) - 50 µg (Cat. No. 39649)



5-Methylcytosine antibody (mAb) (Clone 33D3) tested by Methyl-DNA Immunoprecipitation (MeDIP).
Human DNA (500 ng) digested with Mse I was subjected to MeDIP and then analyzed by quantitative real-time PCR with primers specific for genes that are normally methylated (Xist, NYESO and SNRPN) or unmethylated (APC and p48). The MeDIP'd DNA (enriched DNA) was plotted.

5-Methylcytosine (5-mc) antibody (pAb) tested by Immunohistochemistry
Punctate nuclear staining pattern is detected in Formalin-fixed, paraffin-embedded tissue sections from human substantia nigra (midbrain). Top Panel: 5-mC antibody at 1:1000 dilution. Bottom Panel: No primary antibody (2nd step antibody alone)


5-Methylcytosine (5-Methylcytidine) is a modified base that is found in the DNA of plants and vertebrates. DNA methylation is an epigenetic event in which DNA methyltransferases (DNMTs) catalyze the reaction of a methyl group to the fifth carbon of cytosine in a CpG dinucleotide. This modification helps to control gene expression and is also involved in genomic imprinting, while aberrant DNA methylation is often associated with disease. The 5-methylcytidine antibody (Clone 33D3) has been developed to discriminate between the modified base and its normal cytosine counterpart, allowing for gene promoter methylation analysis.

qPCR Primers

Active Motif's Human Positive Control Primer Set ZC3H13 (Cat. No. 71009) and Human Negative Control Primer Set 1 (Cat. No. 71001) have been validated for performing qPCR and endpoint PCR when this antibody has been used for ChIP on human samples. For ChIP experiments with this antibody on mouse samples, the Mouse Negative Control Primer Set 1 (Cat. No. 71011) has been validated for both qPCR and endpoint PCR.


Some products may be shipped at room temperature. This will not affect their stability or performance. Avoid repeated freeze/thaw cycles by aliquoting items into single-use fractions for storage at -20°C for up to 2 years. Keep all reagents on ice when not in storage.


This product is guaranteed for 12 months from date of receipt.

This product is for research use only and is not for use in diagnostic procedures.

Application Key

  • ChIP = Chromatin Immunoprecipitation;
  • ChIP = ChIP Sequencing;
  • CUT&RUN = Cleavage Under Targets and Release Using Nuclease;
  • CUT&Tag = Cleavage Under Targets and Tagmentation;
  • DB = Dot Blot;
  • ELISA = Enzyme-linked Immunosorbent Assay;
  • EMSA = Electrophoretic Mobility Shift Assay
  • FC = Flow Cytometry;
  • ICC = Immunocytochemistry;
  • IF = Immunofluorescence;
  • IHC = Immunohistochemistry;
  • IP = Immunoprecipitation;
  • MeDIP = Methyl-DNA Immunoprecipitation;
  • NEU = Neutralizing;
  • WB = Western Blotting