HIV gag p24 protein in samples from either precleaned or IP eluant was measured according to our previously published methods (Wu et al., 2017) on the Quanterix HD-X platform. p24 Simoa kit was obtained from Quanterix (Billerica, MA). p24 concentrations were calculated from raw signal average enzyme per bead (AEB) by the instrument’s software with four-parameter logistic regression curve fitting, and p24 levels were reported as pg/million cells or pg/mL in cell lysate and CM (Wu et al., 2017, 2021).
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