Chains and heterogens:
PDB Chain Sequences:
>1xkjA (A:) mkfglfflnfmnskrssdqvieemldtahyvdqlkfdtlavyenhfsnngvvgapltvag fllgmtknakvaslnhvitthhpvrvaeeaclldqmsegrfafgfsdceksadmrffnrp tdsqfqlfsechkiindafttgychpnndfysfpkisvnphafteggpaqfvnatskevv ewaaklglplvfrwddsnaqrkeyaglyhevaqahgvdvsqvrhkltllvnqnvdgeaar aearvyleefvresysntdfeqkmgellsenaigtyeestqaarvaieccgaadllmsfe smedkaqqravidvvnanivkyhs
>1xkjB (B:) mkfglfflnfmnskrssdqvieemldtahyvdqlkfdtlavyenhfsnngvvgapltvag fllgmtknakvaslnhvitthhpvrvaeeaclldqmsegrfafgfsdceksadmrffnrp tdsqfqlfsechkiindafttgychpnndfysfpkisvnphafteggpaqfvnatskevv ewaaklglplvfrwddsnaqrkeyaglyhevaqahgvdvsqvrhkltllvnqnvdgeaar aearvyleefvresysntdfeqkmgellsenaigtyeestqaarvaieccgaadllmsfe smedkaqqravidvvnanivkyhs