@article {cite-key, title = {The Frizzled CRD domain is conserved in diverse proteins including several receptor tyrosine kinases.}, journal = {Curr Biol}, volume = {8}, number = {12}, year = {1998}, month = {Jun}, pages = {R405-6}, issn = {0960-9822 (Print); 0960-9822 (Linking)}, author = {Xu, Y K and Nusse, R} }