Effect of Cby inactivation on Wnt–β-catenin signaling. (A and B) Real-time PCR analysis was performed for expression levels of β-catenin target genes in the nasal epithelium from adult mice (n = 4 for each genotype; A) or PMEFs (n = 6 for each genotype; B). Wild-type (WT) values were set as 1. Data are represented as means ± SEM. KO, knockout.