Spec3 is a family of eukaryotic membrane proteins. In the sea urchin, Spec3 is expressed predominantly during ectodermal ciliogenesis [1].

1: Localization of the sea urchin Spec3 protein to cilia and Golgi complexes of embryonic ectoderm cells. Eldon ED, Montpetit IC, Nguyen T, Decker G, Valdizan MC, Klein WH, Brandhorst BP; Genes Dev. 1990;4:111-122. PMID:2407617

2: Spec3: embryonic expression of a sea urchin gene whose product is involved in ectodermal ciliogenesis. Eldon ED, Angerer LM, Angerer RC, Klein WH; Genes Dev. 1987;1:1280-1292. PMID:2828169