IL-2 activated natural killer cells (A-NK) may have a direct role on the control of L.(L.) amazonensis promastigotes and macrophage infection - Aranha, F. C. S.; Ribeiro Junior, Ulisses; Basse, P.; Monteiro, H. P.; Corbett, Carlos Eduardo Pereira; Laurenti, Marcia Dalastra (Meeting of the brasizilian society of immunology, 2003)