Chains and heterogens:
PDB Chain Sequences:
>1hdr_ (-) earrvlvyggrgalgsrcvqafrarnwwvasvdvveneeasasiivkmtdsfteqadqvt aevgkllgeekvdailcvaggwaggnakskslfkncdlmwkqsiwtstisshlatkhlke gglltlagakaaldgtpgmigygmakgavhqlcqslagknsgmppgaaaiavlpvtldtp mnrksmpeadfsswtpleflvetfhdwitgknrpssgsliqvvttegrteltpayf