Chains and heterogens:
PDB Chain Sequences:
>1frfL (L:) tpqstftgpivvdpitrieghlrimvevengkvkdawsssqlfrgleiilkgrdprdaqh ftqracgvctyvhalassrcvddavkvsipanarmmrnlvmasqylhdhlvhfyhlhald wvdvtaalkadpnkaaklaasidtartgnsekalkavqdklkafvesgqlgiftnayflg ghkayylppevnliatahylealhmqvkaasamailggknphtqftvvggcsnyqgltkd planylalskevcqfvnecyipdllavagfykdwggiggtsnylafgefatddsspekhl atsqfpsgvitgrdlgkvdnvdlgaiyedvkyswyapggdgkhpydgvtdpkytklddkd hyswmkaprykgkamevgplartfiayakgqpdfkkvvdmvlgklsvpatalhstlgrta argietaivcanmekwikemadsgakdntlcakwempeeskgvgladaprgslshwirik gkkidnfqlvvpstwnlgprgpqgdkspveealigtpiadpkrpveilrtvhafdpciac gvh
>1frfS (S:) khrpsvvwlhnaectgcteaairtikpyidalildtisldyqetimaaagetseaalhea legkdgyylvvegglptidggqwgmvaghpmietckkaaakakgiicigtcspyggvqka kpnpsqakgvsealgvktinipgcppnpinfvgavvhvltkgipdldengrpklfygelv hdncprlphfeasefapsfdseeakkgfclyelgckgpvtynncpkvlfnqvnwpvqagh pclgcsepdfwdtmtpfyeqg