>4xfqB (B:) observed residues (from ATOM records)
aglrkmaqpsgvvekcivrvcygnmalnglwlgdtvmcprhviastidydyalsvlrlhn
fsissgnvflgvvgvtmrgallqikvnqnnvhtpkytyrtvrpgesfnilacydgaaagv
ygvnmrsnytirgsfingacgspgyninngtvefcylhqlelgsgchvgsdldgvmyggy
edqptlqvegasslftenvlaflyaalingstwwlsssriavdrfnewavhngmttvvnt
dcfsilaaktgvdvqrllasiqslhknfggkqilgytsltdefttgevirqmyg