Anti-MBNL3 antibodies are used in the immunodetection of the protein muscleblind like splicing regulator 3. In humans, the canonical protein has a reported length of 354 amino acid residues and a mass of 38.5 kDa. Its subcellular localization is in the nucleus and cytoplasm. Alternative splicing is reported to yield 5 different isoforms for this protein. It is reported to be highly expressed in the placenta. A member of a the Muscleblind protein family, MBNL3 is known to mediate pre-mRNA alternative splicing regulation. Synonyms for this target antigen include Cys3His CCG1-required protein, muscleblind-like 3, muscleblind-like X-linked protein, and muscleblind-like protein 3.