Anti-KRTAP2-2 antibodies are used in the immunodetection of the protein keratin associated protein 2-2. In humans, the canonical protein has a reported length of 123 amino acid residues and a mass of 13 kDa. It is notably expressed in the hair. It is a member of the KRTAP type 2 protein family. Synonyms for this target antigen include High sulfur keratin-associated protein 2.1, Keratin-associated protein 2.1, and putative keratin-associated protein ENSP00000381495.