FB2026_03 , released September 17, 2026
CV Term Report
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Term lower segment of Malpighian tubule ID (Ontology) FBbt:00047098 (Fly Anatomy)
Definition Segment of the Malpighian tubule between the main segment and the ureter. It lacks Malpighian tubule type II cells (Sozen et al., 1997) and plays a role in reabsorption (Denholm, 2013).[ FlyBase:FBrf0083335 FlyBase:FBrf0093736 FlyBase:FBrf0098338 FlyBase:FBrf0222532 ]
Also Known As"lower tubule"
CommentThe term 'lower segment' is sometimes used (e.g. in Xu et al., 2022; FBrf0253737) to refer to the entire stem cell zone, comprising both the lower segment as defined here and the ureter.
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Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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 lower segment of Malpighian tubule (all annotations which use CV term, excluding "NOT" statements)
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Malpighian tubule__
epithelial tube____|
                   Malpighian tubule segment
                    |__lower segment of Malpighian tubule  15 rec.
                        |__adult lower segment of Malpighian tubule 12 rec.
                        |   |__adult Malpighian tubule principal cell of lower segment 9 rec.
                        |__embryonic lower segment of Malpighian tubule
                        |__embryonic/larval lower segment of Malpighian tubule
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