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Fig. 7. X-twi expression at stage 35/36. Frontal serial sections show that X-twi transcripts are abundant within the ventral part of the first visceral arches and the forming heart (A-1 to B-2); they are less abundant in the anterior somites than in the posterior ones (C-1 to C.3); X-twi transcripts are also detected in parts of the otic and optic vesicles (D-1 to D-3) and in parts of the neural tube (D.4). E, schematic drawing of the embryo with the plan of different sections; Ant., anterior region; Br. A., cells of visceral arches II and III; Mes., mesodermal cells; Post., posterior region. Bar, 100 mm. |
