P. falciparum IEs were DNA labeled with ethidium bromide and surface labeled with rat anti-HB3VAR21-DBLβ_D4 (1:20) and fluorescein isothiocyanate (FITC)-conjugated secondary rabbit anti-rat IgG (1:150; Vector Labs) as described previously (50 (link)). Fluorescence data from ethidium bromide-positive cells were collected on an FC500 MPL flow cytometer (Beckman Coulter) and analyzed using WinList, version 9.0 (Verity Software House).
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