Chains and heterogens:
PDB Chain Sequences:
>1fviA (A:) aitkpllaatleniedvqfpclatpkiagirsvkqtqmlsrtfkpirnsvmnrlltellp egsdgeisiegatfqdttsavmtghkmynakfsyywfdyvtddplkkyidrvedmknyit vhphilehaqvkiiplipveinnitellqyerdvlskgfegvmirkpdgkykfgrstlke gillkmkqfkdaeatiismtalfkntntktkdnfgyskrsthksgkveedvmgsievdyd gvvfsigtgfdadqrrdfwqnkesyigkmvkfkyfemgskdcprfpvfigirheedr
>1fviA (A:) aitkpllaatleniedvqfpclatpkiagirsvkqtqmlsrtfkpirnsvmnrlltellp egsdgeisiegatfqdttsavmtghakfsyywfdyvtddplkkyidrvedmknyitvhph ilehaqvkiiplipveinnitellqyerdvlskgfegvmirkpdgkykfgrstlkegill kmkqfkdaeatiismtalfksgkveedvmgsievdydgvvfsigtgfdadqrrdfwqnke syigkmvkfkyfemprfpvfigir