Chains and heterogens:
PDB Chain Sequences:
>4n20A (A:) mghhhhhhhhhhssghiegrhmlrertvrlqygsrveavyvlgtylwtdvysaapagaqt fslkhsehvwvevvrdgeaeevatngkqrwllspsttlrvtmsqasteassdkvtvnyyd eegsipidqaglfltaieisldvdadrdgvveknnpkkaswtwgpegqgaillvncdret pwlpkedcrdekvyskedlkdmsqmilrtkgpdrlpagyeivlyismsdsdkvgvfyven pffgqryihilgrrklyhvvkytggsaellffveglcfpdegfsglvsihvslleymaqd ipltpiftdtvifriapwimtpnilppvsvfvccmkdnylflkevknlvektncelkvcf qylnrgdrwiqdeiefgyieaphkgfpvvldsprdgnlkdfpvkellgpdfgyvtreplf esvtsldsfgnlevsppvtvngktyplgriligssfplsggrrmtkvvrdflkaqqvqap velysdwltvghvdefmsfvpipgtkkflllmastsacyklfrekqkdghgeaimfkglg gmsskritinkilsneslvqenlyfqrcldwnrdilkkelglteqdiidlpalfkmdedh raraffpnmvnmivldkdlgipkpfgpqveeecclemhvrglleplglectfiddisayh kflgevhcgtnvrrkpftfkwwhmvpsrrs
>4n20A (A:) rertvrlqygsrveavyvlgtylwtdvysaapagaqtfslkhsehvwvevvrdgeaeeva tngkqrwllspsttlrvtmsqasteassdkvtvnyydeegsipidqaglfltaieisldv dadrdgvveknnpkkaswtwgpegqgaillvncdvyskedlkdmsqmilrtkgpdrlpag yeivlyismsdsdkvgvfyvenpffgqryihilgrrklyhvvkytggsaellffveglcf pdegfsglvsihvslleymaqdipltpiftdtvifriapwimtpnilppvsvfvccmkdn ylflkevknlvektncelkvcfqylnrgdrwiqdeiefgyieaphkgfpvvldsprdgnl ellgpdfgyvtrvtsldsfgnlevsppvtvngktyplgriligssfplsggrrmtkvvrd flkaqqvqapvelysdwltvghvdefmsfvpipgtkkflllmastsacyklfrekqkdgh geaimfkglggmsskritinkilsneslvqenlyfqrcldwnrdilkkelglteqdiidl palfkmdedhraraffpnmvnmivldkdlgipkpfgpqveeecclemhvrglleplglec tfiddisayhkflgevhcgtnvrrkpftfkwwhmvpsrr