Chains and heterogens:
PDB Chain Sequences:
>1pa6A (A:) yeyvelakasltsaqpqhfyavvidatfpyktnqeryicslkivdptlylkqqkgagdas dyatlvlyakrfedlpiihragdiirvhratlrlyngqrqfnanvfyssswalfstdkrs vtqeinnqdavsdttpfsfsskhatiekneisilqnlrkwanqyfssysvissdmytaln kaqaqkgdfdvvakilqvheldeytnelklkdasgqvfytlslklkfphvrtgevvrirs atydetstqkkvlilshysniitfiqssklakelrakiqddhsvevaslkknvslnavvl tevdkkhaalpstslqdlfhhadsdkelqaqdtfrtqfyvtkiepsdvkewvkgydrktk kssslkgasgkgdnifqvqflvkdastqlnnntyrvllytqdglganffnvkadnlhkna darkkledsaelltkfnsyvdavverrngfylikdtkliy
>1pa6B (B:) qqqsafkqlytelfnnegdfskvssnlkkplkcyvkesyphflvtdgyffvapyftkeav nefhakfpnvnivdltdkvivinnwslelrrvnsaevftsyanlearlivhsfkpnlqer lnptrypvnlfrddefkttiqhfrhtalqaainktvkgdnlvdiskvadaagkkgkvdag ivkasaskgdefsdfsfkegntatlkiadifvqekg