Chains and heterogens:
PDB Chain Sequences:
>1r6lA (A:) mnrpsgraadqlrpiritrhytkhaegsvlvefgdtkvictvsaesgvprflkgqgqgwl taeygmlprstgernqreasrgkqggrtleiqrligrslraaldlsklgentlyidcdvi qadggtrtasitgatvalidalavlkkrgalkgnplkqmvaavsvgiyqgvpvldldyle dsaaetdlnvvmtdaggfievqgtaegapfrpaelnamlelaqqgmqelfelqraalae
>1r6lA (A:) mnrpsgraadqlrpiritrhytkhaegsvlvefgdtkvictvsaesgvprflkqgwltae ygmlprstgernqreasrgkqggrtleiqrligrslraaldlsklgentlyidcdviqad ggtrtasitgatvalidalavlkkrgalkgnplkqmvaavsvgiyqgvpvldldyledsa aetdlnvvmtdaggfievqgtaegapfrpaelnamlelaqqgmqelfelqraalae