Chains and heterogens:
PDB Chain Sequences:
>3kbnA (A:) mnyqptpedrftfglwtvgwqgrdpfgdatrraldpvesvrrlaelgahgvtfhdddlip fgssdsereehvkrfrqalddtgmkvpmattnlfthpvfkdggftandrdvrryalrkti rnidlavelgaetyvawggregaesggakdvrdaldrmkeafdllgeyvtsqgydirfai epkpneprgdillptvghalafierlerpelygvnpevgheqmaglnfphgiaqalwagk lfhidlngqngikydqdlrfgagdlraafwlvdllesagysgprhfdfkpprtedfdgvw asaagcmrnylilkeraaafradpevqealrasrldelarptaadglqallddrsafeef dvdaaaargmaferldqlamdhllgarg