- Protective role of ETA endothelin receptors during the acute phase of Trypanosoma cruzi infection in rats. Camargos, E.R., Rocha, L.L., Rachid, M.A., Almeida, A.P., Ferreira, A.J., Teixeira, A.L., Chiari, E., Barton, M., Teixeira, M.M., Machado, C.R. Microbes Infect. (2004)