Fig. 3

DAPT treatment affects somitogenesis in amphioxus embryos. Effect of treatment with 100 μM DAPT at the late blastula stage on mesodermal gene expression (a, b Delta; c, d, Hairy-b; e, f, Gsc; g, h, Brachyury; n = 10 each, 100 %) at the gastrula stage. Dorsal views with the anterior side up. s, somite. Scale bar, 50 μm (a)