>4fr5B (B:) observed residues (from ATOM records)
mklksfgvfgnpikhsksplihnacfltfqkelrflghyhpillpleshikseflhlgls
ganvtlpfkerafqvcdkikgialecgavntlvlendelvgyntdalgfylslkqknyqn
alilgaggsakalacelkkqglqvsvlnrssrgldffqrlgcdcfmeppksafdliinat
saslhnelplnkevlkgyfkegklaydlasgfltpflslakelktpfqdgkdmliyqaal
sfekfsasqipyskafevmrsvf