>4rf3A (A:) observed residues (from ATOM records)
tdrlkgkvaivtggtlgiglaiadkfveegakvvitgrhadvgekaaksiggtdvirfvq
hdasdeagwtklfdtteeafgpvttvvnnagifvsksvedttteewrkllsvnldgvffg
trlgiqrmknkglgasiinmssiegfvgdptlgaynaskgavrimsksaaldcalkdydv
rvntvhpgyiktplvddlegaeemmsqrtktpmghigepndiawicvylasdeskfatga
efvvdggytaq