Fig. 10. XCAD3 expression requires RAR at early but not late stages. Embryos were treated with either TTNPB (E-H) or AGN193109 (I-L) at the blastula stage and cultured until controls (A-D) reached the indicated stages, fixed and processed for in situ hybridization with XCAD3. (A,C,E,G,I,K) Lateral views; (B,D,F,H,J,L) dorsal views.