Ectopic expression of <i>bnl</i> in <i>hairy</i> mutant embryos.

<p>In <i>h<sup>674</sup></i> heterozygous embryos (A), <i>bnl</i> RNA is expressed in clusters close to the tracheal visceral branch (vis) (A, large arrows), in dorsal clusters (dor) (A, small arrowheads) and in lateral clusters (lat) (A, large arrowhead). In <i>h<sup>674</sup></i> homozygous embryos (B), the dorsal clusters of <i>bnl</i> RNA are expanded (B, small arrowheads). In <i>h<sup>47</sup></i> homozygous embryos (C and D), clusters of <i>bnl</i> RNA close to the tracheal visceral branch (vis) (C, large arrow) and dorsal clusters (dor) (D, small arrowheads) are expanded. In wild-type embryos (E and E'), a cluster of <i>bnl</i> expression is found close to the tracheal ganglionic branch (gan) (E and E', small arrows). In <i>h<sup>ACT</sup></i> embryos (F and G), <i>bnl</i> RNA close to the tracheal visceral branch (vis) (F, large arrows) and close to the ganglionic branch (gan) (G, small arrows) are expanded. All embryos shown are at stage 13 and were processed for ISH for <i>bnl</i> RNA and <i>lac-Z</i> to distinguish <i>h<sup>674</sup></i> heterozygous from homozygous embryos. Embryos in panels A and B are lateral views whereas embryos in panels C–G are ventral-lateral views. Panel E' is a more internal focal plane than that shown in panel E.</p>

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