Fig. 6. Inhibition of MAP Kinase signaling does not disrupt specification of the endoderm territory and formation of the oral/aboral axis. Expression of 42C (A-F), brachyury (G-L) and goosecoid (M-R) genes after inhibition of the ERK function. Control embryos on the left, U0126-treated embryos on the right. U0126 treatment does not affect the expression of endoderm (42C) and oral ectoderm (goosecoid and brachyury) marker genes. mB, mesenchyme blastula; lG, late gastrula; vv, vegetal view; ov, oral view.