Retinoic acid and cAMP inhibit rat hepatocellular carcinoma cell proliferation and enhance cell differentiation - Ionta, Marisa; Rosa, M. C.; Almeida, R. B.; Freitas, Vanessa Morais; Rezende-Teixeira, P.; Machado-Santelli, Glaucia Maria (Brazilian Journal of Medical and Biological Research, 2012)