FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term adult midgut constriction R3-R4 ID (Ontology) FBbt:00110917 (Fly Anatomy)
Definition One of the two large constrictions of the adult midgut. It corresponds to an area where the midgut abruptly folds and turns up. It is the most dorsal point of the midgut. The cells in this area accumulate ferritin. It separates region 3 (R3) from region 4 (R4).[ FlyBase:FBrf0008422 FlyBase:FBrf0221749 FlyBase:FBrf0222542 ]
Also Known As "boundary R3-R4" ; "BR3-R4"
Comment Marianes and Spradling (2013) designate this boundary as a distinct subregion (iron region).
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  multi-tissue structure
   |__adult midgut constriction
       |__adult midgut constriction R3-R4
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