Movie S3.

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Microridge fusion and fission reflect fusion and fission of the plasma membrane. 9.5-minute time-lapse video with 30-second intervals of periderm cells expressing fluorescent reporters for actin (Lifeact-GFP) and membrane (mRuby-PH-PLC) on 48hpf zebrafish. Microridge fusion (yellow arrowhead) and fission (white arrowhead) in the actin channel are mimicked by fission and fusion of projections in the membrane channel. Time-lapse frames are sum projection images. Scale bar: 1μm.