Supplemental Figure 1. (A-B) Organizations of the ER in 7 DAP (A) and 12 DAP (B) BETCs. The ER tubules are highlighted in blue. The ER strands are excluded from the WIGs while mitochondria (highlighted in red) display spatial proximity to the WIGs. (C) Cortical cytoplasm in a 12 DAP BETC showing a free-floating TGN (FF) and a cluster of vesicles (dashed oval) in the vicinity of the WIG. (D) Central cytoplasm in a 12 DAP BETC showing a Golgi/TGN complex (arrowhead) and multivesicular bodies (arrows). Scale bar: 500 nm.