Chains and heterogens:
PDB Chain Sequences:
>1k3cA (A:) gltpqeleaygisdvhdivynpsydllyqeeldpsltgyergvltnlgavavdtgiftgr spkdkyivrddttrdtfwwadkgkgkndnkplspetwqhlkglvtrqlsgkrlfvvdafc ganpdtrlsvrfitevawqahfvknmfirpsdeelagfkpdfivmngakctnpqwkeqgl nsenfvafnltermqliggtwyggemkkgmfsmmnyllplkgiasmhcsanvgekgdvav ffglsgtgkttlstdpkrrligddehgwdddgvfnfeggcyaktiklskeaepeiynair rdallenvtvredgtidfddgsktentrvsypiyhidnivkpvskaghatkvifltadaf gvlppvsrltadqtqyhflsgftaklagtergiteptptfsacfgaaflslhptqyaevl vkrmqaagaqaylvntgwngtgkrisikdtraiidailngsldnaetftlpmfnlaipte lpgvdtkildprntyaspeqwqekaetlaklfidnfdkytdtpagaalvaagpkl