FB2026_03 , released September 17, 2026
CV Term Report
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Term chorion ID (Ontology) FBbt:00000038 (Fly Anatomy)
Definition A hard shell external to the vitelline membrane of the egg.
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 chorion (all annotations which use CV term, excluding "NOT" statements)
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anatomical structure
 |__egg_____________________________
 |__acellular anatomical structure__|
                                    chorion  1117 rec.
                                     |__chorionic layer 54 rec.
                                     |   |__endochorion 50 rec.
                                     |   |__exochorion 5 rec.
                                     |   |__inner chorionic layer 1 rec.
                                     |__chorionic specialization 1106 rec.
                                         |__collar 5 rec.
                                         |__dorsal appendage 1079 rec.
                                         |__egg operculum 105 rec.
                                         |__micropyle 49 rec.
                                         |__posterior aeropyle 21 rec.
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Is a acellular anatomical structure
Part of egg
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UBERON:0000920