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Fig. 3. laterne embryo development. (A) Wild-type early heart stage (frontal view). (B-D) Wild-type heart stage series (lateral view). (C) Median optical section comparable to laterne (pid-15 enp) embryo in G. (E) Wild-type late heart stage. (F,G,K) laterne early, mid and late heart stage (K, lateral view). (H,I) A pid-15 embryo with three cotyledons (arrowhead points to third cotyledon). sp, shoot pole; co, cotyledon primordia; hy, hypocotyl; rp, root pole. Nomarski optics. Scale bars: 25 µm.