FB2026_03 , released September 17, 2026
CV Term Report
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Term adult midgut region R4 ID (Ontology) FBbt:00110901 (Fly Anatomy)
Definition Region of the adult midgut that forms a complex loop and that re-orients the gut towards the posterior part of the abdomen and ends ventrally. It can be subdivided into an anterior part containing an extremely folded epithelium (R4a) and two posterior regions composed of cells with short apical protrusions resulting in an enlarged lumen (R4b and R4c).[ FlyBase:FBrf0221749 FlyBase:FBrf0222542 ]
CommentAdult midgut regions R4 and R5 correspond to the previously described posterior midgut (Buchon et al., 2013).
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 adult midgut region R4 (all annotations which use CV term, excluding "NOT" statements)
     adult midgut region R4 | nutrition conditional
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adult midgut
 |__adult midgut region_____
gut section                 |
 |__adult midgut region_____|
adult midgut region         |
 |__adult posterior midgut__|
                            adult midgut region R4  9 rec.
                             |__adult midgut region R4a
                             |__adult midgut region R4b
                             |__adult midgut region R4c
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Is a adult midgut region
Part of adult posterior midgut
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