Orphan receptor that promotes neuronal differentiation of radial glial progenitors (RGPs) (PubMed:27142930). The activity of this receptor is mediated by a G(q)-protein that activates a phosphatidylinositol-calcium second messenger (PubMed:27142930). Expressed in the primary cilia of radial glial progenitors (RGPs) exposed to the cerebrospinal fluid. Expressed in the primary cilia of radial glial progenitors (RGPs) in the developing neocortex (PubMed:27142930). Preferential expression during the early to mid stages of corticogenesis. High levels in the early radial glial progenitors from 10 to 17 dpc and gradually decrease thereafter (at protein level) (PubMed:27142930). Belongs to the G-protein coupled receptor 2 family.