Chains and heterogens:
PDB Chain Sequences:
>1bu2A (A:) rvlnnlklrelllpkftslweiqtevtvdnrtilltwmhllcesfeldksvfplsvsild rylckkqgtkktlqkigaacvligskirtvkpmtvskltylscdcftnlelinqekdile alkwdteavlatdfliplcnalkipedlwpqlyeaasttickaliqpniallspglicag gllttietdntncrpwtcyledlssilnfstntvrtvkdqvseafslyd