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Figure S2. 3D tracking analysis of the interaction between a CB and the U2 array. (A) Approximately 7 h after Dox induction, the relative 3D distance between the U2 array and the nearest CB rapidly decreased during the final approach (boxed). The time window of the final approach (∼6–7 h) was consistent for all videos analyzed (Fig. 2 and not depicted). (B) Targeted component tracking analysis revealed that the induced U2 array moves toward the CB during gap closure (boxed) in contrast to a relatively static CB.