Fig. 2. Expression patterns of iro1 and iro7 at early embryonic stages. (A-I) iro1 expression. (J-R) iro7 expression. (A-C,J-L) Dorsal view of iro1 and iro7 expression at blastula and gastrula stages. Anterior is towards the top. iro1 and iro7 show similar patterns of expression until the late gastrula stage. (D-G,M-P) Dorsal view of iro1 and iro7 expression at the tailbud stage (TB) and early segmental stages (2s, 2 somites; 5s, 5 somites), anterior towards the left. (G,P) Viewed from side. Expression of iro1 and iro7 begins to diverge by the end of the gastrula stage. At 24 hours post fertilization (24h) (H,I,Q,R), expression of iro1 is broad, while iro7 expression is much more restricted (H,Q, dorsal view; I,R, side view).