In consideration that both Smad3 and HIF-2α play prominent effects in the process of CKD, and other HIF-stabilizers are given mostly every 2 days for a long period [8–10], PROTAC administrated subcutaneously with intermittent dosing (24 mg/kg, every 2 days for 5 weeks) was chosen for 5/6Nx mouse model (Fig. 5A). The gene discussed is SMAD3; the disease is chronic kidney disease.