Chains and heterogens:
PDB Chain Sequences:
>4pkqA (A:) snalsryekwekikqhyqhwsdslseegrgllkklqipiepkkddiihslsqeekellkr iqidssdflsteekeflkklqidirdslseeekellnriqvdssnplsekekeflkklkl diqpydinqrlqdtgglidspsinldvrkqykrdiqnidallhqsigstlynkiylyenm ninnltatlgadlvdstdntkinrgifnefkknfkysissnymivdinerpaldnerlkw riqlspdtragylengklilqrnigleikdvqiikqsekeyiridakvvpkskidtkiqe aqlninqewnkalglpkytklitfnvhnryasnivesaylilnewknniqsdlikkvtny lvdgngrfvftditlpniaeqythqdeiyeqvhskglyvpesrsillhgpskgvelrnds egfihefghavddyagylldknqsdlvtnskkfidifkeegsnltsygrtneaeffaeaf rlmhstdhaerlkvqknapktfqfindqikfiinslvpr
>4pkqA (A:) sryekwekikqhyqhwsdslseegrgllkklqipiepkkddiihslsqeekellkriqid ssdflsteekeflkklqidirdslseeekellnriqvdssnplsekekeflkklkldiqp ydinqrlqdtgglidspsinldvrkqykrdiqnidallhqsigstlynkiylyenmninn ltatlgadlvdstdntkinrgifnefkknfkysissnymivdinerpaldnerlkwriql spdtragylengklilqrnigleikdvqiikqsekeyiridakvvpkskidtkiqeaqln inqewnkalglpkytklitfnvhnryasnivesaylilnewknniqsdlikkvtnylvdg ngrfvftditlpniaeqythqdeiyeqvhskglyvpesrsillhgpskgvelrndsegfi hefghavddyagylldknqsdlvtnskkfidifkeegsnltsygrtneaeffaeafrlmh stdhaerlkvqknapktfqfindqikfiinslv