Chains and heterogens:
PDB Chain Sequences:
>1kcuH (H:) qvklqqsgpglvkpsqslsltctvtgysitsdyawnwirqfpgnklewmayisysgstty npslksrisitrdtsknqfflqlnsvttedtaiyycarggtgfdywgagttltvsaaatt ppsvyplapgsataaasmvtlgclvkgyfpepvtvtwnsgalssgvhtfpavlqsdlytl sssvtvpsspwpsetvtcnvahpasstkvdkkivprd
>1kcuL (L:) divltqspksmsmsvgekvtlsckasenvdtyvswyqqrpeqppalliygasnrytgvpd rftgsgsatdftltissvqaedladyhcgqsysypltfgggtklelkradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvanswtaqdskdstysmsstlt ltkdeyerhnsytceathktstspvvksfnrnec