In order to evaluate the specific contribution of macrophage Abcg1 in atherosclerosis development, bone marrow transfer (BMT) from donor Abcg1−/− mice into recipient Ldlr−/− or Apoe−/− mice fed a high-fat and/or a high-cholesterol diet was simultaneously conducted in three different laboratories [89,90,91,92,93,94]. The gene discussed is APOE; the disease is atherosclerosis.