Chains and heterogens:
PDB Chain Sequences:
>1cwn_ (-) aascvllhtgqkmpliglgtwksepgqvkaaikyaltvgyrhidcaaiygneleigealt etvgpgkavpreelfvtsklwntkhhpedvepalrktladlqleyldlylmhwpyaferg dnpfpknadgtirydathykdtwkalealvakglvralglsnfssrqiddvlsvasvrpa vlqvechpylaqneliahcqarglevtaysplgssdrawrdpnepvlleepvvqalaeky nrspaqillrwqvqrkvicipksvtpsripqniqvfdftfspeemkqldalnknlrfivp mltvdgkrvprdaghplypfndpy