Activity of the ribosomal RNA gene promoter as a marker for speciation in Trypanosoma cruzi - Zingales, Bianca; Stolf, Beatriz Simonsen; Souto, R P; Buck, G A; Floeter-Winter, Lucile Maria (Reunião Anual da Sociedade Brasileira de Bioquímica e Biologia Molecular, 1997)