Movie S4.

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An example of a cluster of kinesin‐5 hMBXt motors dragging the plus‐end at which the motors accumulated along another MT, acting to align the two MTs. This demonstrates that the plus‐end clusters are still motile and can withstand load (the MTs are quite bent and still anchored to the coverslip at some sites by an avidin‐biotin interaction). Note that to observe this, a higher density of MTs was immobilized using a lower density of Neutravidin. 50 frames between time points. Scale bar 2μm wide.