Anti-titin antibodies are used in the immunodetection of the protein encoded by the TTN gene. In humans, the canonical protein has a reported length of 34350 amino acid residues and a mass of 3816 kDa. Its subcellular localization is in the nucleus and cytoplasm. Alternative splicing is reported to yield 13 different isoforms for this protein. A member of the CAMK Ser/Thr protein kinase protein family, it is known to be involved with the regulation of gene expression. Post-translational modifications have been described, including phosphorylation. Other names for this target antigen include CMH9, CMPD4, CMYP5, EOMFC, HMERF, LGMD2J, LGMDR10, and CMD1G.