>4r51A (A:) observed residues (from ATOM records)
gytvavvgatgavgaqmikmleestlpidkirylasarsagkslkfkdqditieetteta
fegvdialfsagsstsakyapyavkagvvvvdntsyfrqnpdvplvvpevnahaldahng
iiacpncstiqmmvalepvrqkwgldriivstyqavsgagmgailetqrelrevlndgvk
pcdlhaeilpsggdkkhypiafnalpqidvftdndytyeemkmtketkkimeddsiavsa
tcvripvlsahsesvyietkevapieevkaaiaafpgavleddvahqiypqainavgsrd
tfvgrirkdldaekgihmwvvsdnllkgaawnsvqiaetlherglvrptaelkfelkleh