Video S3.

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Rap1^N17 border cells are initially highly protrusive but migrate slower than control. Example of a live stage 9 Rap1^N17 (c306-GAL4/+; UAS-Rap1^N17/slbo-LifeAct-GFP) egg chamber in which the cluster completely detaches from the anterior follicle cells and migrates partway to the oocyte. Similar to Video 2, multiple cells extend protrusions during the first half of the Video, especially "side" cells (until ~1:30; time in h:min). Border cells eventually become rounder than normal. Frames were acquired every 2 min with a 20x objective. Anterior is to the left.