Chains and heterogens:
PDB Chain Sequences:
>2xylA (A:) attlkeaadgagrdfgfaldpnrlseaqykaiadsefnlvvaenamkwdatepsqnsfsf gagdrvasyaadtgkelyghtlvwhsqlpdwaknlngsafesamvnhvtkvadhfegkva swdvvneafadgggrrqdsafqqklgngyietafraaraadptaklcindynveginaks nslydlvkdfkargvpldcvgfqshlivgqvpgdfrqnlqrfadlgvdvriteldirmrt psdatklatqaadykkvvqacmqvtrcqgvtvwgitdkyswvpdvfpgegaalvwdasya kkpayaavmeaf