FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term egg chamber ID (Ontology) FBbt:00004894 (Fly Anatomy)
Definition Female germline cyst that forms as the 16-cell cyst moves posteriorly through the germarium, becoming encapsulated in follicle cells (Spradling, 1993). Its formation is completed in germarium region 3, where it buds off from the germarium and progresses posteriorly along the ovariole (Spradling, 1993, Reichmann and Ephrussi, 2001).[ FlyBase:FBrf0064777 ]
Also Known As "follicle" ; "germarium derived egg chamber"
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Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 egg chamber (all annotations which use CV term, excluding "NOT" statements)
     egg chamber | absent
      --       --
     egg chamber | absent | somatic clone - tissue specific
      --       --
      --
     egg chamber | adult stage
      --       --
     egg chamber | adult stage | conditional
      --       --
      --
     egg chamber | anterior
      --       --
     egg chamber | anterior | somatic clone
      --       --       --       --
     egg chamber | calorie restriction conditional
      --       --
     egg chamber | cell autonomous | germline clone
      --       --
      --
     egg chamber | cell non-autonomous | germline clone
      --       --       --       --
     egg chamber | cell non-autonomous | somatic clone
      --       --
      --
     egg chamber | clone of cells
      --       --       --
     egg chamber | conditional
      --       --       --
     egg chamber | decreased number
      --       --
     egg chamber | decreased number | oogenesis
      --       --       --
     egg chamber | drug conditional
      --       --       --       --
     egg chamber | germline clone
      --       --
     egg chamber | germline clone | maternal effect
      --       --       --       --
     egg chamber | germline clone | nutrition conditional
      --       --       --       --
     egg chamber | germline clone | oogenesis
      --       --
      --
     egg chamber | germline clone | oogenesis stage S14
      --       --
      --
     egg chamber | germline clone | oogenesis stage S6
      --       --       --       --
     egg chamber | germline clone | oogenesis stage S7
      --       --       --       --
     egg chamber | germline clone | oogenesis | progressive
      --       --       --       --
     egg chamber | germline clone | somatic clone
      --       --       --       --
     egg chamber | heat sensitive
      --       --
     egg chamber | increased number
      --       --       --
     egg chamber | lateral
      --       --
      --
     egg chamber | maternal effect
      --       --
      --
     egg chamber | maternal effect | heat sensitive
      --       --       --       --
     egg chamber | maternal effect | somatic clone
      --       --       --       --
     egg chamber | nutrition conditional
      --       --       --
     egg chamber | oogenesis
      --       --
     egg chamber | oogenesis stage S10
      --       --
     egg chamber | oogenesis stage S10 | somatic clone
      --       --       --       --
     egg chamber | oogenesis stage S10B
      --       --       --
     egg chamber | oogenesis stage S14
      --       --
     egg chamber | oogenesis stage S5
      --       --       --       --
     egg chamber | oogenesis stage S5 | somatic clone
      --       --       --       --
     egg chamber | oogenesis stage S7
      --       --
      --
     egg chamber | oogenesis stage S8
      --       --
     egg chamber | oogenesis stage S9
      --       --       --
     egg chamber | oogenesis | somatic clone
      --       --
     egg chamber | P-stage
      --       --       --       --
     egg chamber | pharate adult stage
      --       --       --       --
     egg chamber | somatic clone
      --       --
     egg chamber | temperature conditional
      --       --       --
Spanning Tree (Parents/Children)
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germline cyst______________________
ovariole___________________________|
female-specific anatomical entity__|
                                   female germline cyst
                                    |__egg chamber  5551 rec.
                                        |__follicle cell 2679 rec.
                                        |   |__border follicle cell 1054 rec.
                                        |   |__centripetal follicle cell 121 rec.
                                        |   |__main body follicle cell(+) 137 rec.
                                        |   |__polar follicle cell(+) 213 rec.
                                        |   |__stalk follicle cell 289 rec.
                                        |   |__stretch follicle cell 84 rec.
                                        |   |__terminal follicle cell(+) 12 rec.
                                        |__nurse cell 1345 rec.
                                        |   |__nurse cell fusome 22 rec.
                                        |   |__nurse cell spectrosome 18 rec.
                                        |__nurse cell associated follicular epithelium 86 rec.
                                        |   |__stretch follicle cell 84 rec.
                                        |__oocyte 1864 rec.
                                        |   |__oocyte nucleus(+) 328 rec.
                                        |   |__pole plasm(+) 159 rec.
                                        |   |__stage S1 oocyte 10 rec.
                                        |   |__stage S2 oocyte
                                        |   |__stage S3 oocyte
                                        |   |__stage S4 oocyte 4 rec.
                                        |   |__stage S5 oocyte
                                        |   |__stage S6 oocyte
                                        |   |__stage S7 oocyte
                                        |   |__stage S8 oocyte
                                        |   |__stage S9 oocyte
                                        |   |__stage S10 oocyte(+)
                                        |   |__stage S11 oocyte
                                        |   |__stage S12 oocyte
                                        |   |__stage S12A oocyte
                                        |   |__stage S12B oocyte
                                        |   |__stage S12C oocyte
                                        |   |__stage S13 oocyte
                                        |   |__stage S13A oocyte
                                        |   |__stage S13B oocyte
                                        |   |__stage S13C oocyte
                                        |   |__stage S13D oocyte
                                        |   |__stage S14 oocyte 18 rec.
                                        |   |__stage S14A oocyte
                                        |   |__stage S14B oocyte
                                        |__oocyte associated follicular epithelium 194 rec.
                                            |__main body follicle cell(+) 137 rec.
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UBERON:0003199