Chains and heterogens:
PDB Chain Sequences:
>1ai1H (H:) qvklqesgpavikpsqslsltcivsgfsitrtnycwhwirqapgkglewmgricyegsiy yspsiksrstisrdtslnkffiqlisvtnedtamyycsrenhmyetyfdvwgqgttvtvs sakttppsvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqs dlytlsssvtvpssprpsetvtcnvahpasstkvdkkivpr
>1ai1L (L:) divmtqspaslvvslgqratiscrasesvdsygksfmhwyqqkpgqppkvliyiasnles gvparfsgsgsrtdftltidpveaddaatyycqqnnedpptfgagtklemrradaaptvs ifppsseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysms stltltkdeyerhnsytceathktstspivksfnr