Anti-KRTAP4-2 antibodies are used in the immunodetection of the protein keratin associated protein 4-2. In humans, the canonical protein has a reported length of 136 amino acid residues and a mass of 14.5 kDa. It is a member of the KRTAP type 4 protein family. Synonyms for this target antigen include keratin-associated protein 4.2 and ultrahigh sulfur keratin-associated protein 4.2.