Figure 3
From: Time-dependent patterning of the mesoderm and endoderm by Nodal signals in zebrafish
Treatment at MBT blocks the response to receptors activated during the cleavage stages. Embryos injected at the 1–4 cell stage with 10pg β-galactosidase (A-D), TARAM-D (E-H), or sqt (I-L) mRNA, and treated at 2.75 h with DMSO (A, E, I, C, G, K) or SB-431542 (B, F, J, D, H, L). (E, G) TARAM-D induces ectopic body axes and gsc expression. (F, H) The effects of TARAM-D are suppressed by treatment with SB-431542. (I, K) sqt overexpression arrests epiboly and induces ubiquitous expression of gsc. (J, L) The response to ubiquitous Sqt is blocked by treatment with SB-431542. Images of live embryos at 30 h, anterior to the left (A, B, E, F, I, J). Animal pole views of fixed embryos at 5 h, dorsal to the right (C, D, G, H, K, L).