Arthofer, E., J. Dijksterhuis, B. Hot, P. Kozielewicz, M. Lauth, J. Olofsson, J. Petersen, T. Polonio, G. Schulte, K. Strakova, J. Valnohova, and S. Wright. “Class Frizzled GPCRs (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database”. IUPHAR/BPS Guide to Pharmacology CITE, Vol. 2019, no. 4, Sept. 2019, doi:10.2218/gtopdb/F25/2019.4.