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Fig. 3. Expression of Shisa2 in somitogenesis. (A) Temporal
expressions of Shisa2 were analyzed by RT-PCR with RNAs isolated from
stages indicated at the top. (B-F') Whole-mount in situ
hybridization of Shisa2. (B) Dorsal view of the early neurula stage
embryo (stage 14). Anterior is to the left. (C) Lateral view of tailbud stage
embryo (stage 26). (D) Lateral view of tadpole (stage 33). (E-F')
Whole-mount in situ hybridization of stage 15 embryos (dorsal view, anterior
towards the left). Thy1 probe alone (E) or together with
Shisa2 probe (E'). Shisa2 expression covers
S-III/Thy1 stripes (arrowheads in E and E'). Mes1
probe alone (F, light blue) or together with Shisa2 (F',
purple). Shisa2 expression overlaps that of Mes1. (G)
Schematic diagram showing the geometric relationship between the transition
point and expression of Thy1, Mes1 and Shisa2. The
most caudal Thy1 stripe marks the most newly fate-determined
somitomere (S-III, red asterisk), which has just passed through the transition
point (wavefront). bm, body wall muscle; hm, head mesenchyme; ov, otic
vesicle.