Toxicological evaluation by in vitro and in vivo assays of an aqueous extract prepared from Echinodorus macrophyllus leaves - da Costa Lopes, L; Albano, F; Laranja, G AT; Alves, L M; Silva, L FM; Souza, G P; Araujo, I M; Nogueira-Neto, F; Felzenszwalb, I; Kovary, K (Toxicol Lett, 2000)