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Figure 4: Quantitative motility analysis of free-swimming epimastigotes. The analysis of motility traces of fluorescent epimastigotes showed that the average velocities of the parasites ranged from 1 μm/10 second to 400 μm/10 sec. The histograms show the range of distances that each cell traversed per 10 sec. For each parasite trajectory, 100 randomly chosen cells were analyzed.