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Sensitivity of Env clones amplified from IVC2 patients to IgG1b12 antibody. Env-pseudotyped viruses were incubated with IgG1b12 at indicated concentrations for 1 hour before TZM-bl cells were added as described in the Methods. The reduction of infectivity of TZM-bl cells was measured as a function of the degree of IgG1b12 mediated neutralization of these Envs.
