Anti-TNNI1 antibodies are used in the immunodetection of the protein troponin I1, slow skeletal type. In humans, the canonical protein has a reported length of 187 amino acid residues and a mass of 21.7 kDa. A member of the Troponin I protein family, it is known to be involved with muscle contraction. Synonyms for this target antigen include TNN1, troponin I, slow skeletal muscle, troponin I type 1 (skeletal, slow), and SSTNI.