Anti-SRm300 antibodies enable researchers to detect and measure the SRm300 antigen in biological samples. This target is a reported synonym of the SRRM2 gene, which encodes serine/arginine repetitive matrix 2. This protein is known to function in RNA splicing, among other biological roles. The human version of SRm300 has a canonical amino acid length of 2752 residues and a protein mass of 299.6 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the nucleus of cells and widely expressed in many tissue types. SRm300 is a member of the CWC21 protein family.