>2f3tB (B:) observed residues (from ATOM records)
aqgtlyivsapsgagkssliqallktqplydtqvsvshttrqprpgevhgehyffvnhde
fkemisrdaflehaevfgnyygtsreaieqvlatgvdvfldidwqgaqqirqkmpharsi
filppskieldrrlrgrseeviakrmaqavaemshyaeydylivnddfdtaltdlktiir
aerlrmsrqkqrhdaliskllad