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Kinetics of MAb 4E10 and 2G12 binding to unliganded and CD4-liganded HIV-1 MN. MAb 4E10 or 2G12 were added to virions preassociated with CD4 (CD4-preliganded) or added simultaneously with CD4 (CD4-coliganded) and incubated for the indicated time prior to PAG labeling.
