Figure 6

Expression of Dio3 during the third wave. In situ hybridizations were performed using a Dio3 probe on flat mounted retinas at three different stages of chick development: Stage 35 (A), Stage 37 (B), and Stage 39 (C). The dorsal side of the retina is at the top of the flatmount and the ventral side at the bottom, while anterior (nasal) is toward the left and posterior (temporal) is toward the right.