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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Nat Struct Mol Biol. 2009 Jun 14;16(7):684–690. doi: 10.1038/nsmb.1610
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A1: TADNKFNKEQ QNAFWEILHL PNLNEEQRNG FIQCLKDDPS QSANLLAEAK KLNDAQAPKA
A2-X: TADNKFNKEQ QNAFWEILHL PNLNEEQRNX FIQCLKDDPS QSANLLAEAK KLNDAQAPKA
E1: TADNKFNKEQ QNAFWEILHL PNLNEEQRNG ϕIQCLKDDPS QSANLLAEAK KLNDAQAPKA
E2-X: TADNKFNKEQ QNAFWEILHL PNLNEEQRNX ϕIQCLKDDPS QSANLLAEAK KLNDAQAPKA