Chains and heterogens:
PDB Chain Sequences:
>1xisA (A:) nyqptpedrftfglwtvgwqgrdpfgdatrraldpvesvrrlaelgahgvtfhdddlipf gssdsereehvkrfrqalddtgmkvpmattnlfthpvfkdggftandrdvrryalrktir nidlavelgaetyvawggregaesggakdvrdaldrmkeafdllgeyvtsqgydirfaie pkpneprgdillptvghalafierlerpelygvnpevgheqmaglnfphgiaqalwagkl fhidlngqngikydqdlrfgagdlraafwlvdllesagysgprhfdfkpprtedfdgvwa saagcmrnylilkeraaafradpevqealrasrldelarptaadglqallddrsafeefd vdaaaargmaferldqlamdhllgarg