>2a4nB (B:) observed residues (from ATOM records)
miisefdrnnpvlkdqlsdllrltwpeeygdssaeeveemmnperiavaavdqdelvgfi
gaipqygitgwelhplvvessrrknqigtrlvnylekevasrggitiylgtddldhgttl
sqtdlyehtfdkvasiqnlrehpyefyeklgykivgvlpnangwdkpdiwmaktiiprp