sequence of cytokeratin 13 K1C13_MOUSE 47 kDa cytokeratin CK-13 Cytokeratin-13 IMR:0700846 K13 Keratin, type I cytoskeletal 13 Keratin-13 Krt-1.13 Krt1-13 Krt13 UniProt:P08730 keratin 13 molecule_role