Figure 4
Exogenous retinoic acid causes ectopic expression of sftpc in the presumptive thyroid. Whole mount in situ hybridization for sftpc demonstrated that embryos treated at stage 26 with exogenous retinoic acid showed ectopic expression of sftpc in the developing thyroid (red arrows) as well as the normal expression in the lung (green arrows). (side - side view, ventral - ventral view).