>1g21B (B:) observed residues (from ATOM records)
sqqvdkikasyplfldqdykdmlakkrdgfeekypqdkidevfqwtttkeyqelnfqrea
ltvnpakacqplgavlcalgfektmpyvhgsqgcvayfrsyfnrhfrepvscvsdsmted
aavfggqqnmkdglqnckatykpdmiavsttcmaevigddlnafinnskkegfipdefpv
pfahtpsfvgshvtgwdnmfegiaryftlksmddkvvgsnkkinivpgfetylgnfrvik
rmlsemgvgysllsdpeevldtpadgqfrmyaggttqeemkdapnalntvllqpwhlekt
kkfvegtwkhevpklnipmgldwtdeflmkvseisgqpipasltkergrlvdmmtdshtw
lhgkrfalwgdpdfvmglvkfllelgcepvhilchngnkrwkkavdailaaspygknatv
yigkdlwhlrslvftdkpdfmignsygkfiqrdtlhkgkefevplirigfpifdrhhlhr
sttlgyegamqilttlvnsilerldeetrgmqatdynhdlvr