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Differences in var transcript abundance (x-fold changes) between 3D7UM and antibody-selected 3D7SM parasites (15). Transcript abundance was measured by using primers targeting var gene groups (white) or primers targeting single var genes (black) and are summarized corresponding to var gene groups. A twofold change in var transcript abundance (dashed lines) was arbitrarily defined as the cutoff for biologically significant changes in var transcript abundance.
