Enhancement of activity of 1α,25-dihydroxyvitamin D3 for growth inhibition and differentiation induction of human myelomonocytic leukemia cells by tretinoin tocoferil, a α-tocopherol ester of all-trans-retinoic acid - Makishima,M.; Kanatani,Y.; Yamamoto-Yamaguchi,Y.; Honma,Y. (Blood, 1996)