Chains and heterogens:
PDB Chain Sequences:
>1bi4A (A:) spgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktvhtd ngsnftsttvkaacwwagikqefgipynpqsqgviesmnkelkkiigqvrdqaehlktav qmavfihnhkrkggiggysagerivdiiatdi
>1bi4A (A:) spgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktvhtd ngsnftsttvkaacwwagikqefgiesmnkelkkiigqvrdqaehlktavqmavfihnhk rkggiggysagerivdiiatdi
>1bi4B (B:) spgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktvhtd ngsnftsttvkaacwwagikqefgipynpqsqgliesmnkelkkiigqvrdqaehlktav qmavfihnhkrkggiggysagerivdiiatdiq
>1bi4B (B:) spgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktvhtd ngsnftsttvkaacwwagikqefliesmnkelkkiigqvrdqaehlktavqmavfihnhk rkggiggysagerivdiiatdiq
>1bi4C (C:) mhgqvdcspgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwp vktvhtdngsnftsttvkaacwwagikqefgipynpqsqgviesmnkelkkiigqvrdqa ehlktavqmavfihnhkrkggiggysagerivdiiatdiq