>4xk9E (E:) observed residues (from ATOM records)
ddklhsqanlmrlksdlfnrspmypgptkddpltvtlgftlqdivkadsstnevdlvyye
qqrwklnslmwdpneygnitdfrtsaadiwtpditaysstrpvqvlspqiavvthdgsvm
fipaqrlsfmcdptgvdseegatcavkfgswvysgfeidlktdtdqvdlssyyasskyei
lsatqtrqvqhysccpepyidvnlvvkfrerr