>1u31B (B:) observed residues (from ATOM records)
pmeisgthteinldnaidmireansiiitpgyglcaakaqypiadlvkmlteqgkkvrfg
ihpvagrmpgqlnvllaeagvpydivlemdeinhdfpdtdlvlvigandtvnsaaqedpn
siiagmpvlevwkskqvivmkrslgvgyaavdnpifykpntamllgdakktcdalqakvr
es