Anti-troponin T type 3 (skeletal, fast) antibodies enable researchers to detect and measure the troponin T type 3 (skeletal, fast) antigen in biological samples. This target is a reported synonym of the TNNT3 gene, which encodes troponin T3, fast skeletal type. This protein is known to function in muscle contraction, among other biological roles. The human version of troponin T type 3 (skeletal, fast) has a canonical amino acid length of 269 residues and a protein mass of 31.8 kilodaltons, although 7 isoforms have been identified. It is reported to be notably expressed in the skeletal muscle and skin. Other names for this target antigen include DA2B2, TNTF, and beta-TnTF.