Polant es are established along anterior- 29.3A gradient must be posterior (head-tail) axis and dorsal-ventral (back-abdomen) converted into discrete Enteric Posterior compartments Ventral he larva Mouth parts are at antenor, tail parts at Figure 29. 1 Gradients in the postenior. Bands of denticles extend from the ventral side, and identify segmentation units egg are translated into along the anterior-postenor axis segments on the anterior posterior axis and into Mouth Denticles specialized structures on the Adult fly dorsal-ventral axis of the Segmented structure has 3 thoracic segments &8 abdominal segments larva. and then into the segmented structure of the adult fly 消当 Thorax AbdomenFigure 29.1 Gradients in the egg are translated into segments on the anterior￾posterior axis and into specialized structures on the dorsal-ventral axis of the larva, and then into the segmented structure of the adult fly. 29.3 A gradient must be converted into discrete compartments