existence starts during or after
start stage
end stage
existence ends during or before
zone of polarizing activity pelvic fin bud
ZFA:0001452
TAO:0001452
zebrafish_anatomy
ZPA
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.
portion of tissue
unknown
larval:days 14-20