Anti-KRTAP20-4 antibodies are used in the immunodetection of the protein keratin associated protein 20-4. In humans, the canonical protein has a reported length of 44 amino acid residues and a mass of 4.6 kDa. It is a member of the KRTAP type 20 protein family. Synonyms for this target antigen include putative keratin-associated protein 20-4.