Essential oil from Ageratum fastigiatum reduces expression of the pro-inflammatory cytokine tumor necrosis factor-alpha in peripheral blood leukocytes subjected to in vitro stimulation with phorbol myristate acetate - Avelar-Freitas, B A; Almeida, V G; Santos, M G; Santos, J AT; Barroso, P R; Grael, C FF; Gregório, L E; Rocha-Vieira, E; Brito-Melo, G EA (Rev Bras Farmacogn, 2015)