6CCB:
reference: Molecular basis of unusually high neutralization resistance in tier 3 HIV-1 strain 253-11., Moyo T, Ereno-Orbea J, Jacob RA, Pavillet CE, Kariuki SM, Tangie EN, Julien JP, Dorfman JR, J Virol. 2018 Apr 4. pii: JVI.02261-17. doi: 10.1128/JVI.02261-17. PMID: 29618644

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