Movie 4.

Ventral AFBp cells start dorsal migration from 30 h APF onward. Representative lateral view movie of abdominal AFBp cells expressing CD4::tdGFP driven by 31F09-Gal4 plus Ay-Gal4. Until 30 h APF, AFBp cells were only seen at the ventral side of the abdomen and migrated in the posterior direction. After 30 h APF, a subset of these cells started moving dorsally and covered almost the entire areas of the pleurite and tergite. Anterior is to the left, and dorsal is up.