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Absence of nonspecific antibody interactions with virions in FCS. Fluorescence correlation plots with JRFL or BaL pseudovirus and NL4-3 virus in the presence or absence of 100 μg/ml sCD4 are shown for Alexa Fluor 647-labeled nonspecific human IgG1 (A) or for Alexa Fluor 647-labeled Synagis (6 μg/ml) (B). The experiment was repeated with similar results.
