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Figure 1. BMP Antagonists Are Expressed in Spemann’s OrganizerBlastula and gastrula embryos were bisected, stained, and then cleared to visualize expression of follistatin (A, F, K, and P), chordin (B, G, L, and Q), noggin (C, H, M, and R), xnr3 (D, I, N, and S), and cerberus (E, J, O, and T) at midblastula (A–E), late blastula (F–J), early gastrula (K–O), and midgastrula (P–T). Dorsal is to the right with the animal pole toward the top of the figure. St = stage.
