Chains and heterogens:
PDB Chain Sequences:
>1tvcA (A:) crisfgevgsfeaevvglnwvssntvqfllqkrpdecgnrgvkfepgqfmdltipgtdvs rsyspanlpnpegrleflirvlpegrfsdylrndarvgqvlsvkgplgvfglkergmapr yfvaggtglapvvsmvrqmqewtapnetriyfgvntepelfyidelkslersmrnltvka cvwhpsgdwegeqgspidalredlessdanpdiylcgppgmidaacelvrsrgipgeqvf fekflpsgaa