| Term Name: | zone of polarizing activity pectoral fin bud |
|---|---|
| Synonyms: | ZPA |
| Definition: | A small group of mesodermal cells located at the posterior margin of the developing fin bud. The ZPA is thought to produce retinoic acid and thereby provides positional information to the developing bud. |
| Appears at: | Pharyngula:Prim-5 (24.0h-30.0h) |
| Evident until: | Pharyngula:Prim-15 (30.0h-36.0h) |
| Ontology: | Anatomy Ontology [ZFA:0001451] |
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