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Fig. 5 | BMC Developmental Biology

Fig. 5

From: Electrochemical gradients are involved in regulating cytoskeletal patterns during epithelial morphogenesis in the Drosophila ovary

Fig. 5

Development of the organisation of microtubules (MT) in the FCE during S8–12. Tangential optical sections (see Fig. 3) of typical anti-acetylated α-tubulin-treated follicles are shown. In the cuboidal FC of S8, the preferential MT-orientation is, similar to the bMF-orientation, perpendicular to the follicle’s a-p axis (indicated as parallel green lines at the right margin). To illustrate the location, shape and size of FC in S8, an area of the FCE (surrounded by a dotted green line) and the FC borders are highlighted in the right column. From S9 onward, the circumferential MT-orientation no longer exists. Diffuse MT enclose the FC nuclei (dark regions in the centre of the cells) in a basket-like arrangement. a During S9–12, the squamous FC covering the NC show a uniform organisation of MT. No preferential MT-orientation referred to the follicle’s axes is discernible in these FC. b In the columnar FC, in addition to the basket-like arrangement, a longitudinal MT-orientation develops during S9–12 (parallel green lines at the right margin): In S9, the MT of cFC and mbFC first become oriented along the a-p axis of the follicle. From S10a-12, this pattern spreads out to the pFC. The two right columns show magnifications of boxed areas in the two left columns. For abbreviations, see legend to Fig. 1. Scale bars refer to all pictures in the same column

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