This family includes the eukaryotic chibby proteins. These proteins inhibit the wingless/Wnt pathway by binding to beta-catenin and inhibiting beta-catenin-mediated transcriptional activation. Chibby is Japanese for small, and is named after the RNAi phenotype seen in Drosophila [1].

1: Chibby, a nuclear beta-catenin-associated antagonist of the Wnt/Wingless pathway. Takemaru K, Yamaguchi S, Lee YS, Zhang Y, Carthew RW, Moon RT; Nature. 2003;422:905-909. PMID:12712206