Although this diet schedule is necessary to yield vitamin A deficient mice (see methods), because we can generate vitamin D deficiency in a shorter time frame, we compared survival from BCR-ABL ALL between vitamin D sufficient mice and mice rendered VDD by placing them on a vitamin D deficient diet at 4 weeks (weaning) and using them after 10 weeks of age. This evidence concerns the gene ABL1 and acute lymphoblastic leukemia.