Chains and heterogens:
PDB Chain Sequences:
>1k2yX (X:) mstakaptlpasifraydirgvvgdtltaetaywigraigseslargepcvavgrdgrls gpelvkqliqglvdcgcqvsdvgmvptpvlyyaanvlegksgvmltgahnppdyngfkiv vagetlaneqiqalreriekndlasgvgsveqvdilpryfkqirddiamakpmkvvvdcg ngvagviapqliealgcsviplycevdgnfpnhhpdpgkpenlkdliakvkaenadlgla fdgdgdrvgvvtntgtiiypdrllmlfakdvvsrnpgadiifdvkctrrlialisgyggr pvmwktghslikkkmketgallagemsghvffkerwfgfddgiysaarlleilsqdqrds ehvfsafpsdistpeinitvtedskfaiiealqrdaqwgegnittldgvrvdypkgwglv rasnttpvlvlrfeadteeeleriktvfrnqlkavdsslpvpf
>1k2yX (X:) kaptlpasifraydirgvvgdtltaetaywigraigseslargepcvavgrdgrlsgpel vkqliqglvdcgcqvsdvgmvptpvlyyaanvlegksgvmltgahnppdyngfkivvage tlaneqiqalreriekndlasgvgsveqvdilpryfkqirddiamakpmkvvvdcgngva gviapqliealgcsviplycevdgnfpnhhpdpgkpenlkdliakvkaenadlglafdgd gdrvgvvtntgtiiypdrllmlfakdvvsrnpgadiifdvkctrrlialisgyggrpvmw ktghslikkkmketgallagemsghvffkerwfgfddgiysaarlleilsqdqrdsehvf safpsdistpeinitvtedskfaiiealqrdaqwgegnittldgvrvdypkgwglvrasn ttpvlvlrfeadteeeleriktvfrnqlkavdsslpvpf