Chains and heterogens:
PDB Chain Sequences:
>1r4xA (A:) mhhhhhhmtrqeifqeqlaavpefrglgplfksspepvalteseteyvirctkhtftnhm vfqfdctntlndqtlenvtvqmepteayevlcyvparslpynqpgtcytlvalpkedpta vactfscmmkftvkdcdpttgetddegyedeyvledlevtvadhiqkvmklnfeaawdev gdefekeetftlstiktleeavgnivkflgmhpcersdkvpdnknthtlllagvfrgghd ilvrsrlllldtvtmqvtarsleelpvdiilasvg
>1r4xA (A:) mhhhhhhmtrqeifqeqlaavpefrglgplfksspepvalteseteyvirctkhtftnhm vfqfdctntlndqtlenvtvqmepteayevlcyvparslpynqpgtcytlvalpkedpta vactfscmmkftvkdcdpttgetddegyedeyvledlevtvadhiqkvmklnfeaawdev gdefekeetftlstiktleeavgnivkflgmhpcersdkvpdnknthtlllagvfrgghd ilvrsrlllldtvtmqvtarsleelpvdiilasv