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Microtubule-based motility and fission of early and late endocytic vesicles. Texas-red–labeled early and late endocytic vesicles were bound to rhodamine-labeled microtubules (MTs) within a glass microscopy chamber. Motility (A) and fission (B) of these vesicles were quantified following addition of 50 μM ATP. The total number of MT-bound vesicles and the total number of motile vesicles that were examined are shown in parentheses in A and B, respectively.
