Chains and heterogens:
PDB Chain Sequences:
>4xis_ (-) nyqptpedrftfglwtvgwqgrdpfgdatrraldpvesvrrlaelgahgvtfhdddlipf gssdsereehvkrfrqalddtgmkvpmattnlfthpvfkdggftandrdvrryalrktir nidlavelgaetyvawggregaesggakdvrdaldrmkeafdllgeyvtsqgydirfaie pkpneprgdillptvghalafierlerpelygvnpevgheqmaglnfphgiaqalwagkl fhidlngqngikydqdlrfgagdlraafwlvdllesagysgprhfdfkpprtedfdgvwa saagcmrnylilkeraaafradpevqealrasrldelarptaadglqallddrsafeefd vdaaaargmaferldqlamdhllgarg