Expression of m5/m8 starts during cellularization. Movie showing cellularizing membranes using the marker Gap43-mCherry (maximum intensity projection of medial slices and orthogonal views, left) and transcription from m5/m8-MS2[II] (maximum intensity projection with maximum Y projection of the MCP-GFP channel, right). 0.36 μm/px XY resolution, 36x1μm slices and time resolution of 20s/frame. Anterior to the left; embryo imaged from the ventral side. Time indicates minutes from the beginning of nc14.