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(A–C) Midgut of symbiotic insect. (D–E) Midgut of aposymbiotic insect. Abbreviations: M1, midgut first region; M2, midgut second region; M3, midgut third region; M4, midgut fourth region with crypts; M4B, anterior bulb of midgut fourth section; H, hindgut. Bars show 2 mm.
