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Researchers investigating the mechanism of vesicular transport assembled a cell-free system that included microtubule tracks, vesicles, and ATP. However, they observed no movement of transport of vesicles in this system. What were they missing? - A. an axon
- B. contractile microfilaments
- C. intermediate filaments
- D. motor proteins+ p# P1 z! Z" p8 P& k/ `
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answer: D
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