FB2026_03 , released September 17, 2026
CV Term Report
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Term stage S1 oocyte ID (Ontology) FBbt:00005261 (Fly Anatomy)
Definition Oocyte during stage 1 of oogenesis. It is found at the posterior end of the newly-formed egg chamber in region 3 of the germarium (Reichmann and Ephrussi, 2001) and is a similar size to the nurse cells (Mahowald and Kambysellis, 1980).[ FlyBase:FBrf0021038 FlyBase:FBrf0034074 FlyBase:FBrf0064777 FlyBase:FBrf0137209 ]
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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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 stage S1 oocyte (all annotations which use CV term, excluding "NOT" statements)
     stage S1 oocyte | increased number
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germarium
 |__germarium region 3_____________
egg chamber                        |
 |__oocyte_________________________|
portion of tissue                  |
 |__germarium region 3_____________|
female-specific anatomical entity  |
 |__germarium region 3_____________|
female germline cell               |
 |__oocyte_________________________|
                                   stage S1 oocyte  10 rec.
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Is a oocyte
Part of germarium region 3
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