Fig. 5. Spatial expression of HrFGFR as revealed by whole-mount in situ hybridization with DIG-labeled antisense probes. (A) An unfertilized egg. (B) A fertilized egg. (C) An 8-cell stage embryo, lateral view. (D,D') A 16-cell stage embryo viewed from (D) the animal pole (future ventral side) and (D') vegetal pole (future dorsal side). (E,E') A 32-cell stage embryo; (E) animal view and (E') vegetal view. (F) A 64-cell stage embryo, animal view. (G) A 110-cell stage embryo, animal view. (H) A gastrula, vegetal view. (I,I') A neurula, (I) dorsal view and (I') lateral view. Signals for zygotic expression are evident in cells of the epidermis in the posterior region. (J,J') An early tailbud embryo viewed from the lateral (J) and dorsal (J') side. (K) A mid-tailbud embryo, lateral view. Signal is seen in epidermal cells of the tail. The scale bar is 100 µm for all panels.