Chains and heterogens:
PDB Chain Sequences:
>4pkrA (A:) snalsryekwekikqhyqhwsdslseegrgllkklqipiepkkddiihslsqeekellkr iqidssdflsteekeflkklqidirdslseeekellnriqvdssnplsekekeflkklkl diqpydinqrlqdtgglidspsinldvrkqykrdiqnidallhqsigstlynkiylyenm ninnltatlgadlvdstdntkinrgifnefkknfkysissnymivdinerpaldnerlkw riqlspdtragylengklilqrnigleikdvqiikqsekeyiridakvvpkskidtkiqe aqlninqewnkalglpkytklitfnvhnryasnivesaylilnewknniqsdlikkvtny lvdgngrfvftditlpniaeqythqdeiyeqvhskglyvpesrsillhgpskgvelrnds egfihefghavddyagylldknqsdlvtnskkfidifkeegsnltsygrtneaeffaeaf rlmhstdhaerlkvqknapktfqfindqikfiinslvpr
>4pkrA (A:) ryekwekikqhyqhwsdslseegrgllkklqipiepkkddiihslsqeekellkriqids sdflsteekeflkklqidirdslseelsekekeflkklkldiqpydinqrlqdtgglids psinldvrkqykrdiqnidallhqsigstlynkiylyenmninnltatlgadlvdstdnt kinrgifnefkknfkysissnymivdinerpaldnerlkwriqlspdtragylengklil qrnigleikdvqiikqsekeyiridakvvpkskidtkiqeaqlninqewnkalglpkytk litfnvhnryasnivesaylilnewknniqsdlikkvtnylvdgngrfvftditlpniae qythqdeiyeqvhskglyvpesrsillhgpskgvelrndsegfihefghavddyagylld knqsdlvtnskkfidifkeegsnltsygrtneaeffaeafrlmhstdhaerlkvqknapk tfqfindqikfiins