The PER2::LUC activities were generally higher in CKD kidney slices (n = 4 animals) than control kidney slices (n = 3 animals), although the difference was not statistically significant (Control 4154 ± 928 cpm; CKD 6094 ± 1077 cpm; p = 0.22, Mann–Whitney U-test) (Figure 3B). The gene discussed is PER2; the disease is chronic kidney disease.