Temporal range and spatial pattern are conserved in Drosophila simulans
(A–D‴) Temporal range of patency in D. simulans. St 10a (B-B‴) and St 10b (C-C‴) show TC gaps characteristic of patency, while St 9 (A-A‴) and St 11 (D-D‴) have intact TCs.
(E–F″) Spatial pattern of patency in D. simulans is similar to that in D. melanogaster. (E–E″) Dorsal view of a stage 10b egg chamber in D. simulans. Box 1 in the dorsal anterior is expanded in (F and F′) showing intact TCs (yellow arrowheads). Box 2 in the dorsal posterior is expanded in (F″ and F‴) showing TC gaps (red arrowheads). Scale bars: (A–D) and (E-E′), 20 μm; (A′–D″) and (F–F″) 2 μm.