Chains and heterogens:
PDB Chain Sequences:
>1rekA (A:) gnaaaakkgseqesvkeflakakedflkkwetpsqntaqldqfdriktlgtgsfgrvmlv khkesgnhyamkildkqkvvklkqiehtlnekrilqavnfpflvklefsfkdnsnlymvm eyvaggemfshlrrigrfsepharfyaaqivltfeylhsldliyrdlkpenllidqqgyi qvtdfgfakrvkgrtwtlcgtpeylapeiilskgynkavdwwalgvliyemaagyppffa dqpiqiyekivsgkvrfpshfssdlkdllrnllqvdltkrfgnlkngvndiknhkwfatt dwiaiyqrkveapfipkfkgpgdtsnfddyeeeeirvsinekcgkeftef
>1rekA (A:) esvkeflakakedflkkwetpsqntaqldqfdriktlgtgsfgrvmlvkhkesgnhyamk ildkqkvvklkqiehtlnekrilqavnfpflvklefsfkdnsnlymvmeyvaggemfshl rrigrfsepharfyaaqivltfeylhsldliyrdlkpenllidqqgyiqvtdfgfakrvk grtwtlcgtpeylapeiilskgynkavdwwalgvliyemaagyppffadqpiqiyekivs gkvrfpshfssdlkdllrnllqvdltkrfgnlkngvndiknhkwfattdwiaiyqrkvea pfipkfkgpgdtsnfddyeeeeirvsinekcgkeftef