>2bk4B (B:) observed residues (from ATOM records)
nkcdvvvvgggisgmaaakllhdsglnvvvleardrvggrtytlrnqkvkyvdlggsyvg
ptqnrilrlakelgletykvneverlihhvkgksypfrgpfppvwnpityldhnnfwrtm
ddmgreipsdapwkaplaeewdnmtmkelldklcwtesakqlatlfvnlcvtaethevsa
lwflwyvkqcggttrifsttnggqerkfvggsgqvserimdllgdrvklerpviyidqtr
envlvetlnhemyeakyvisaipptlgmkihfnpplpmmrnqmitrvplgsvikcivyyk
epfwrkkdycgtmiidgeeapvaytlddtkpegnyaaimgfilahkarklarltkeerlk
klcelyakvlgslealepvhyeeknwceeqysggcyttyfppgiltqygrvlrqpvdriy
fagtetathwsgymegaveageraareilhamgkipedeiwqsepesvdvpaqpitttfl
erhlpsvpgllrli