Microscopy from Scientific Research

PMI in embryos at a similar stage as in a . Top: mid-sagittal section; inset: higher magnification of the posterior midgut region showing apical constriction and invagination of the posterior midgut primordium; bottom: surface dorsal view of a Drosophila embryo showing the formation of the circular contractile domain of the posterior midgut that encloses the pole cells (arrow).

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