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Fig. 3 Placing prdm1 in genetic hierarchies. (A-D) Lateral view, dorsal to the right. (E,F) Dorsal view, anterior to the top. (H-K) Animal view, dorsal to the bottom. (L,M) Vegetal view, dorsal to the top. (G,N) Lateral view of trunk-tail junction, anterior to the left. (A,H;B,I;C,J;D,K) Different views of same embryo. (H,I) Different focal plane in box. (A,H,E,L,G) Normal prdm1 expression at the conclusion of gastrulation, at early somitogenesis and at 24 hpf; compare Fig. 2 for details. prdm1 expression in boz (B,I), MZoep (C,J), swr (D,K), din (F), smu (M) and cas (N) mutants. For details see text. Scale bar: 200 µm in A; 50 µm in G.