>2b4yB (B:) observed residues (from ATOM records)
psssmadfrkffakakhiviisgagvsaesgvptgywrkwqaqdlatplafahnpsrvwe
fyhyrrevmgskepnaghraiaecetrlgkqgrrvvvitqnidelhrkagtknlleihgs
lfktrctscgvvaenykspicpalsgkgapepgtqdasipveklprceeagcggllrphv
vwfgenldpaileevdrelahcdlclvvgtssvvypaamfapqvaargvpvaefntettp
atnrfrfhfqgpcgttlpeala