| Term Name: | ball | 
|---|---|
| Synonyms: | yolk ball | 
| Definition: | The anterior round region of the yolk cell present after the yolk extension forms during the segmentation period. | 
| Appears at: | Segmentation:10-13 somites (14.0h-16.0h) | 
| Evident until: | Larval:Day 4 (96.0h-120.0h) | 
| Ontology: | Anatomy Ontology [ZFA:0000006] | 
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