Sagara N, Toda G, Hirai M, Terada M, Katoh M (1998). „Molecular cloning, differential expression, and chromosomal localization of human frizzled-1, frizzled-2, and frizzled-7”. Biochem Biophys Res Commun. 252 (1): 117—22. PMID9813155. doi:10.1006/bbrc.1998.9607.
Sagara N, Toda G, Hirai M, Terada M, Katoh M (1998). „Molecular cloning, differential expression, and chromosomal localization of human frizzled-1, frizzled-2, and frizzled-7”. Biochem Biophys Res Commun. 252 (1): 117—22. PMID9813155. doi:10.1006/bbrc.1998.9607.