3VGX:
reference: Discovery of critical residues for viral entry and inhibition through structural Insight of HIV-1 fusion inhibitor CP621-652., Chong H, Yao X, Qiu Z, Qin B, Han R, Waltersperger S, Wang M, Cui S, He Y, J Biol Chem. 2012 Jun 8;287(24):20281-9. doi: 10.1074/jbc.M112.354126. Epub 2012 , Apr 16. PMID: 22511760

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