Chains and heterogens:
PDB Chain Sequences:
>4nfrA (A:) mtschiaeehiqkvaifggthgneltgvflvkhwlengaeiqrtglevkpfitnpravkk ctryidcdlnrifdlenlgkkmsedlpyevrraqeinhlfgpkdsedsydiifdlhntts nmgctliledsrnnfliqmfhyiktslaplpcyvyliehpslkyattrsiakypvgievg pqpqgvlradildqmrkmikhaldfihhfnegkefppcaievykiiekvdyprdengeia aiihpnlqdqdwkplhpgdpmfltldgktiplggdctvypvfvnaaayyekkeafakttk ltlnaksircclh
>4nfrA (A:) hiqkvaifggthgneltgvflvkhwlengaeiqrtglevkpfitnpravkkctryidcdl nrifdlenlgkkmsedlpyevrraqeinhlfgpkdsedsydiifdlhnttsnmgctlile dsrnnfliqmfhyiktslaplpcyvyliehpslkyattrsiakypvgievgpqpqgvlra dildqmrkmikhaldfihhfnegkefppcaievykiiekvdyprdengeiaaiihpnlqd qdwkplhpgdpmfltldgktiplggdctvypvfvnaaayyekkeafakttkltlnaksir c
>4nfrB (B:) mtschiaeehiqkvaifggthgneltgvflvkhwlengaeiqrtglevkpfitnpravkk ctryidcdlnrifdlenlgkkmsedlpyevrraqeinhlfgpkdsedsydiifdlhntts nmgctliledsrnnfliqmfhyiktslaplpcyvyliehpslkyattrsiakypvgievg pqpqgvlradildqmrkmikhaldfihhfnegkefppcaievykiiekvdyprdengeia aiihpnlqdqdwkplhpgdpmfltldgktiplggdctvypvfvnaaayyekkeafakttk ltlnaksircclh
>4nfrB (B:) hiqkvaifggthgneltgvflvkhwlengaeiqrtglevkpfitnpravkkctryidcdl nrifdlenlgkkmsedlpyevrraqeinhlfgpkdsedsydiifdlhnttsnmgctlile dsrnnfliqmfhyiktslaplpcyvyliehpslkyattrsiakypvgievgpqpqgvlra dildqmrkmikhaldfihhfnegkefppcaievykiiekvdyprdengeiaaiihpnlqd qdwkplhpgdpmfltldgktiplggdctvypvfvnaaayyekkeafakttkltlnaksir c