>3pk7A (A:) observed residues (from ATOM records)
lkirdaytivtcpgrnfvtlkivtesgthgigdatlngremavaayldehvvpaligrda
griedtwqylyrgaywrrgpvtmtaiaavdmalwdikakaagmplyqllggksrervmty
ahctgqtiedclgevarhvelgyravrvqsgvpgiettygvyepadsslpaehvwsteky
lnhapklfaavrerfgddlhvlhdvhhrltpieaarlgkavepyhlfwledcvpaenqes
lrlirehtttplaigevfnsihdcreliqnqwidyirmplthgggitamrrvadlaslyh
vrtgfhgptdlspvclgaaihfdtwvpnfgiqehmphtdetdavfphdyrfedghflage
spghgvdideelaakypyeraslpvnrledgtlwhw