FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term germ layer ID (Ontology) FBbt:00000110 (Fly Anatomy)
Definition Complex primordium that is formed during gastrulation (stage 6-7), when anlagen invaginate from the monolayer of the cellular blastoderm (Campos-Ortega and Hartenstein, 1997; Hartenstein, 2004). The invaginated anlagen become organized into the middle two layers of a three-layered tube structure (Campos-Ortega and Hartenstein, 1997). These three layers correspond to the three germ layers of the endoderm, mesoderm and ectoderm (from inner to outer, respectively), with each layer having distinct cell division patterns and cell fates (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 FlyBase:FBrf0155831 FlyBase:FBrf0178740 ]
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Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       2
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 Alleles
 germ layer (all annotations which use CV term, excluding "NOT" statements)       2
     germ layer | embryonic stage       2
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developing material anatomical entity
 |__developing embryonic structure__
 |__primordium______________________|
multicellular structure             |
 |__portion of tissue_______________|
                                    germ layer  2944 rec.
                                     |__ectoderm 1424 rec.
                                     |__endoderm 886 rec.
                                     |__mesoderm 1987 rec.
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Is a developing embryonic structure
primordium
portion of tissue
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UBERON:0000923