Ontology describing the anatomy of Danio rerio from a single cell to adult fish. The namespace of the ontology is zebrafish_anatomical_ontology the prefix is ZFA. Updates to ZFA are released every other month. A subset of the ZFS http://purl.obolibrary.org/obo/zfs.obo is packaged with this ontology.
fin fold is a surface structure
need def.
fin fold: p_pectoral fin fold Ppelvic fin fold P median fin fold
(YMB)
Decided that the paired fins develop from buds not folds. so have median fin fold, and pec and pelvic fin bud.