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Sagara N, Toda G, Hirai M, Terada M, Katoh M (Nov 1998). "Molecular cloning, differential expression, and chromosomal localization of human frizzled-1, frizzled-2, and frizzled-7". Biochemical and Biophysical Research Communications. 252 (1): 117–22. doi:10.1006/bbrc.1998.9607. PMID9813155.