Top: At S10B, D. melanogaster egg chambers express cell-type-specific markers in discrete, non-overlapping domains: pnt (green, midline), broad (red, DA roof cells), and Cic (blue, main body cells). Bottom: At S10B in S. lebanonensis, these markers overlap in a dorsolateral band: pnt (green region bounded by a dotted line), broad (red region bounded by a solid line), Cic (blue region bounded by a dashed line). Dark green (pnt, broad, and Cic) and purple (broad, Cic) regions illustrate where these transcription factors overlap.