2LY0:
reference: Structure and inhibition of the drug-resistant S31N mutant of the M2 ion channel of influenza A virus., Wang J, Wu Y, Ma C, Fiorin G, Wang J, Pinto LH, Lamb RA, Klein ML, Degrado WF, Proc Natl Acad Sci U S A. 2013 Jan 9. PMID: 23302696

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