Gutierrez FR, Lalu MM, Mariano FS, Milanezi CM, Cena J, Gerlach RF, et al. Increased activities of cardiac matrix metalloproteinases matrix metalloproteinase (MMP)-2 and MMP-9 are associated with mortality during the acute phase of experimental Trypanosoma cruzi infection. The gene discussed is MMP9; the disease is Chagas disease.