Fig. 4. Localised patterns of gene expression in visceral muscle founders. (A-C) Embryos stained with antibodies against Connectin. (A) Dorsolateral view of stage 11 embryo showing consecutive sets of Connectin-expressing visceral founders in adjacent segments. (B) Stage 13 embryo showing the dorsoventrally expanded domain of Connectin expression. (C) sns mutant embryo at stage 13 showing restriction of Connectin expression to the circular founders (arrow). Note the adjacent population of fusion-competent myoblasts (arrowhead) that are not recruited to expression in the absence of fusion. (D-F) Stage 11 embryos stained to reveal expression of (D) wg (anti-Wg), (E) dpp (in situ hybridisation), (F) abd-A (anti-Abd-A) in subsets of circular visceral muscle founder cells.
