Chains and heterogens:
PDB Chain Sequences:
>1cva_ (-) wgygkhngpehwhkdfpiakgerqspvdidthtakydpslkplsvsydqatslrilnngh afnvefddsqdkavlkggpldgtyrliqfhfhwgsldgqgsehtvdkkkyaaelhlvhwn tkygdfgkavqqpdglavlgiflkvgsakpglqkvvdvldsiktkgksadftnfdprgll pesldywtypgslvtppllecvtwivlkepisvsseqvlkfrklnfngegepeelmvdnw rpaqplknrqikasf