>1z42B (B:) observed residues (from ATOM records)
arklftpitikdmtlknrivmspmcmysshekdgkltpfhmahyisraigqvgliiveas
avnpqgritdqdlgiwsdehiegfaklteqvkeqgskigiqlahagrkaelegdifapsa
iafdeqsatpvemsaekvketvqefkqaaarakeagfdvieihaahgyliheflsplsnh
rtdeyggspenryrflreiidevkqvwdgplfvrvsasdytdkgldiadhigfakwmkeq
gvdlidcssgalvhadinvfpgyqvsfaekireqadmatgavgmitdgsmaeeilqngra
dlifigrellrdpffartaakqlnteipapvqyergw