ARL13B and Complex Cyst of Kidney: Consistent with previous reports from the cPkd2 and cPkd1 strain, we observed kidney cyst formation in Arl13b-EGFPtg:cPkd2 and Arl13b-EGFPtg:cPkd1 mice (Figure 1—figure supplement 1, Figure 1—figure supplement 2B).