Figure 9

Mesodermal band expansion. (A-L) Single-channel, z-stacks of confocal images of larvae (dashed line) after labeling micromeres 3c or 3d with DiI (white). In (A, G) mesodermal bands (arrows), forming circular muscle fibers (arrowheads), and forming longitudinal muscle fibers (closed arrowheads) are indicated. The blastomere labeled with DiI is indicated to the left of each row, the stage of each larva is indicated above each column and the view is indicated to the left of each row (vent = ventral, llat = left lateral, rlat = right lateral). Anterior is to the left in all ventral and left lateral images and to the right in all right lateral images. The position of the mouth is indicated with an asterisk. The position of the prototroch (pt) and telotroch (tt) are indicated.