The exact function of these proteins has not been determined but they may provide a mechanism by which retinoic acid can influence G protein signal transduction cascades. In addition, RAIG receptors interact with members of the frizzled class of G protein-coupled receptors and appear to activate the Wnt signaling pathway.[5]
^Bräuner-Osborne H, Krogsgaard-Larsen P (2000). "Sequence and expression pattern of a novel human orphan G-protein-coupled receptor, GPRC5B, a family C receptor with a short amino-terminal domain". Genomics. 65 (2): 121–8. doi:10.1006/geno.2000.6164. PMID10783259.
^Robbins MJ, Michalovich D, Hill J, Calver AR, Medhurst AD, Gloger I, Sims M, Middlemiss DN, Pangalos MN (2000). "Molecular cloning and characterization of two novel retinoic acid-inducible orphan G-protein-coupled receptors (GPRC5B and GPRC5C)". Genomics. 67 (1): 8–18. doi:10.1006/geno.2000.6226. PMID10945465.
^Bräuner-Osborne H, Jensen AA, Sheppard PO, Brodin B, Krogsgaard-Larsen P, O'Hara P (2001). "Cloning and characterization of a human orphan family C G-protein coupled receptor GPRC5D". Biochim. Biophys. Acta. 1518 (3): 237–48. doi:10.1016/s0167-4781(01)00197-x. PMID11311935.