Fig. 4. phyl, sina and ttk interact genetically in es organ development. (A-F) Adult nota. (G-L) Adult abdominal segment 2-4. The genotypes of A-L are indicated above. (M,N) X-gal staining to show expression of A101 (M) and ase-lacZ (N) in sina²/sina³ pupal nota. In M, the dashed line marks the midline, and arrows mark the region where A101-positive cells were missing. (O,P) sina mutant embryos that lack both maternal and zygotic sina transcripts show strong reduction in the number of neurons (red) and sheath cells (green) (O), but most of the dm region still contains eight Cut-positive cells (purple) (P). (Q) Anti-Elav staining of a phyl¹/phyl²; ttk^osn/+ embryo. The ventral region was out of focus.