Fig. 7. Expression of sc and sc target genes in the antenna. (A-D) sc mRNA detected by in situ hybridisation. (A) Wild type, with sc expressed not only in the second antennal segment (caret) but also in the third segment (arrows). (B) Wild type, with sc RNA detected by immunofluorescence (green). (C) amos¹ mutant. sc mRNA is increased and is present in SOPs (arrows). (D) The second segment sc expression is reduced in lz³⁴ mutants. (E,F) Ac expression is present in some SOPs in amos mutants. (E) Wild type at 8 hours APF, showing very little Ac expression in the third segment (first precursor wave marked by arrow) (some is visible in the second segment; caret). (F) amos³ mutant at 8 hours APF, showing some Ac expression in second segment (arrow). (G,H) GFP expression from sc-E1-GFP reporter transgene. (G) Wild type, showing no expression in third segment. (H) amos³ mutant showing expression (*).