Chains and heterogens:
PDB Chain Sequences:
>1bkxA (A:) qesvkeflakakedflkkwetpsqntaqldqfdriktlgtgsfgrvmlvkhkesgnhyam kildkqkvvklkqiehtlnekrilqavnfpflvklefsfkdnsnlymvmeyvaggemfsh lrrigrfsepharfyaaqivltfeylhsldliyrdlkpenllidqqgyiqvtdfgfakrv kgrtwtlcgtpeylapeiilskgynkavdwwalgvliyemaagyppffadqpiqiyekiv sgkvrfpshfssdlkdllrnllqvdltkrfgnlkngvndiknhkwfattdwiaiyqrkve apfipkfkgpgdtsnfddyeeeeirvsinekcgkeftef