>4r54B (B:) observed residues (from ATOM records)
gytvavvgatgavgaqmikmleestlpidkirylasarsagkslkfkdqditieetteta
fegvdialfsagsstsakyapyavkagvvvvdntsyfrqnpdvplvvpevnahaldahng
iiacpncstiqmmvalepvrqkwgldriivstyqavsgagmgailetqrelrevlndgvk
pcdlhaeilpsggdkkhypiafnalpqidvftdndytyeemkmtketkkimeddsiavsa
tcvripvlsahsesvyietkevapieevkaaiaafpgavleddvahqiypqainavgsrd
tfvgrirkdldaekgihmwvvsdnllkgaawnsvqiaetlherglvrptaelkfelk