3.4. The Effect of Niao Du Kang Mixture on the mRNA Expression Levels of E-Cadherin, α-SMA, Collagen I, β-Catenin, Wnt-1, and LEF-1 in Peritoneal Tissue of Peritoneal Fibrosis Rats. This evidence concerns the gene WNT1 and Peritoneal Fibrosis.