Chains and heterogens:
PDB Chain Sequences:
>1bk4A (A:) fdtdistmtrfvmeegrkaggtgemtqllnslctavkaistavrkagiahlygiagstnv tgdqvkkldvlsndlvmnmlkssfatcvlvseedknaiivepekrgkyvvcfdpldgssn idclvsigtifgiyrkkstdepstkdalqpgrnlvaagyalygsatmlvlaggsgvnsfm ldpaigefilvdknvkikkkgniyslnegyakdfdpavteyiqkkkfppdnsspygaryv gsmvadvhrtlvyggiflypankkspdgklrllyecnpmafimekaggmattgkeaildi vptdihqrapvilgspddvqefleiykkhavk
>1bk4A (A:) fdtdistmtrfvmeegrkaggtgemtqllnslctavkaistavrkagikldvlsndlvmn mlkssfatcvlvseedknaiivepekrgkyvvcfdpldgssnidclvsigtifgiyrkks tdepstkdalqpgrnlvaagyalygsatmlvlaggsgvnsfmldpaigefilvdknvkik kkgniyslnegyakdfdpavteyiqkkkfppdnsspygaryvgsmvadvhrtlvyggifl ypankkspdgklrllyecnpmafimekaggmattgkeaildivptdihqrapvilgspdd vqefleiykkhavk