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Profilin is not essential for actin-based motility of Listeria in platelet extracts. The mean rate of movement of Listeria was measured in mock-depleted extracts, profilin-depleted extracts, profilin + VASP double- depleted extracts, supplemented with the indicated amounts of recombinant VASP or purified bovine profilin. Mean rate values result from the average of 10 measurements.
