Anti-KRTAP5-4 antibodies are used in the immunodetection of the protein keratin associated protein 5-4. In humans, the canonical protein has a reported length of 288 amino acid residues and a mass of 25.2 kDa. It is a member of the KRTAP type 5 protein family. Synonyms for this target antigen include keratin-associated protein 5.4 and ultrahigh sulfur keratin-associated protein 5.4.