>2f3rB (B:) observed residues (from ATOM records)
aqgtlyivsapsgagkssliqallktqplydtqvsvshttrqprpgevhgehyffvnhde
fkemisrdaflehaevfgnyygtsreaieqvlatgvdvfldidwqgaqqirqkmpharsi
filppskieldrrlrgseeviakrmaqavaemshyaeydylivnddfdtaltdlktiira
erlrmsrqkqrhdaliskl