FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term adult midgut region R3 ID (Ontology) FBbt:00110897 (Fly Anatomy)
Definition Region of the adult midgut that contains the copper cells. This region initiates a retrograde folding of the midgut, (from posterior to anterior), and it follows a ventral-dorsal axis. It can be subdivided into an anterior section containing the copper cells (R3ab) and a posterior one with large flat cells (R3c).[ FlyBase:FBrf0216495 FlyBase:FBrf0221749 ]
Also Known As"adult acid zone" ; "adult middle midgut"
CommentThis adult midgut region corresponds to the previously described region called middle midgut (Buchon et al., 2013).
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 adult midgut region R3 (all annotations which use CV term, excluding "NOT" statements)
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adult midgut
 |__adult midgut region__
midgut                   |
 |__middle midgut________|
gut section              |
 |__middle midgut________|
 |__adult midgut region__|
                         adult midgut region R3  89 rec.
                          |__adult middle midgut class I enteroendocrine cell
                          |__adult middle midgut class II enteroendocrine cell
                          |__adult midgut region R3ab 32 rec.
                          |   |__adult copper cell 22 rec.
                          |   |__adult midgut interstitial cell 8 rec.
                          |   |__adult midgut region R3a 4 rec.
                          |   |__adult midgut region R3b 4 rec.
                          |__adult midgut region R3c 7 rec.
                          |   |__adult midgut large flat cell 7 rec.
                          |__enterocyte of middle adult midgut epithelium 35 rec.
                              |__adult copper cell 22 rec.
                              |__adult midgut interstitial cell 8 rec.
                              |__adult midgut large flat cell 7 rec.
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