Video 7. Horizontal cells (HCs) send dynamic protrusions during migration and only form blebs prior to mitosis.

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Time-lapse imaging of an HC migration shows that it sends dynamic protrusions while migrating. Upon rounding prior to mitosis, the tracked HC displays membrane blebbing. Tg(ptf1a:Gal4-VP-16,UAS:gap-YFP) labels HC membrane. Red dot: tracked HC, red arrowhead: blebs, white and black dots: sister cells of the tracked HC after division. Time in h:min. Scale bar: 20 µm.