Chains and heterogens:
PDB Chain Sequences:
>1kfuL (L:) agiaaklakdreaaeglgsheraikylnqdyealrnecleagtlfqdpsfpaipsalgfk elgpyssktrgmrwkrpteicadpqfiiggatrtdicqgalgdcwllaaiasltlneeil arvvplnqsfqenyagifhfqfwqygewvevvvddrlptkdgellfvhsaegsefwsall ekayakingcyealsggattegfedftggiaewyelkkpppnlfkiiqkalqkgsllgcs iditsaadseaitfqklvkghaysvtgaeevesngslqklirirnpwgevewtgrwndnc pswntidpeererltrrhedgefwmsfsdflrhysrleicnltpdtltsdtykkwkltkm dgnwrrgstaggcrnypntfwmnpqylikleeededeedgesgctflvgliqkhrrrqrk mgedmhtigfgiyevpeelsgqtnihlsknffltnrarersdtfinlrevlnrfklppge yilvpstfepnkdgdfcirvfsekkadyqavddeieanleefdiseddiddgvrrlfaql agedaeisafelqtilrrvlakrqdiksdgfsietckimvdmldsdgsgklglkefyilw tkiqkyqkiyreidvdrsgtmnsyemrkaleeagfkmpcqlhqvivarfaddqliidfdn fvrclvrletlfkifkqldpentgtieldliswlcfsvl
>1kfuS (S:) thysnieaneseevrqfrrlfaqlagddmevsatelmnilnkvvtrhpdlktdgfgidtc rsmvavmdsdttgklgfeefkylwnnikrwqaiykqfdtdrsgticsselpgafeaagfh lnehlynmiirrysdesgnmdfdnfisclvrldamfrafksldkdgtgqiqvniqewlql tmys