>1xy3B (B:) observed residues (from ATOM records)
savkaarygkdnvrvykvhkdektgvqtvyemtvcvllegeietsytkadnsvivatdsi
kntiyitakqnpvtppelfgsilgthfiekynhihaahvnivchrwtrmdidgkphphsf
irdseekrnvqvdvvegkgidiksslsgltvlkstnsqfwgflrdeyttlketwdrilst
dvdatwqwknfsglqevrshvpkfdatwatarevtlktfaednsasvqatmykmaeqila
rqqlietveyslpnkhyfeidlswhkglqntgknaevfapqsdpnglikctvgrs