To evaluate the origin of the renal cysts in CY mice at 18 weeks of life, we analyzed the Dolichos biflorus agglutinin (DBA, a collecting duct/distal tubule marker) and Lotus tetragonolobus lectin (LTL, a proximal tubule marker) staining patterns in the renal cysts. This evidence concerns the gene RPS19 and Renal cyst.