Chains and heterogens:
PDB Chain Sequences:
>1c4xA (A:) tveiiekrfpsgtlashalvagdpqspavvllhgagpgahaasnwrpiipdlaenffvva pdligfgqseypetypghimswvgmrveqilglmnhfgiekshivgnsmggavtlqlvve aperfdkvalmgsvgapmnarppelarllafyadprltpyrelihsfvydpenfpgmeei vksrfevandpevrriqevmfesmkagmeslvippatlgrlphdvlvfhgrqdrivpldt slyltkhlkhaelvvldrcghwaqlerwdamgpmlmehfra