FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term stage 4 embryo ID (Ontology) FBbt:00005306 (Fly Anatomy)
Definition Nuclear division 10-13. Polar buds divide twice and become tightly grouped at the posterior pole by the end of this stage. Nuclei visible at the rim of the embryo. Stage 4 ends with the beginning of cellularization. Duration at 25 degrees C: approximately 50 minutes (80-130 minutes after egg laying).[ FlyBase:FBrf0089570 ]
Comment DEPRECATION WARNING.
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embryo
 |__cleavage stage embryo________
blastoderm embryo                |
 |__syncytial blastoderm embryo__|
                                 stage 4 embryo  9 rec.
                                  |__cycle 11 embryo 6 rec.
                                  |__cycle 12 embryo 6 rec.
                                  |__cycle 13 embryo 2 rec.
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Is a cleavage stage embryo
syncytial blastoderm embryo
Develops from stage 3 embryo
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