Chains and heterogens:
PDB Chain Sequences:
>1by7A (A:) medlcvantlfalnlfkhlakasptqnlflspwsisstmamvymgsrgstedqmakvlqf nevgaaadkihssfrslssainastgnyllesvnklfgeksasfreeyirlcqkyyssep qavdflecaeearkkinswvktqtkgkipnllpegsvdgdtrmvlvnavyfkgkwktpfe kklnglypfrvnsaqrtpvqmmylreklnigyiedlkaqilelpyagdvsmflllpdeia dvstglelleseitydklnkwtskdkmaedevevyipqfkleehyelrsilrsmgmedaf nkgranfsgmserndlflsevfhqamvdvneegteaaagtggvmtgrtghggpqfvadhp flflimhkitncilffgrfssp
>1by7A (A:) edlcvantlfalnlfkhlakasptqnlflspwsisstmamvymgsrgstedqmakvlqfn evgaadkihssfrslssainllesvnklfgeksasfreeyirlcqkyyssepqavdflec aeearkkinswvktqtkgkipnllpegsvdgdtrmvlvnavyfkgkwktpfekklypfrv nsaqrtpvqmmylreklnigyiedlkaqilelpyagdvsmflllpdeiadvstglelles eitydklnkwtskdkmaedevevyipqfkleehyelrsilrsmgmedafnkgranfsgms erndlflsevfhqamvdvneegtgpqfvadhpflflimhkitncilffgrfssp