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The complete intracellular cycle of five cloned stocks of Trypanosoma cruzi was quantified. Marked but stable interclonal differences were found in the length of the pre-replicative lag period (18.2-34.2 h), amastigote doubling time (8.6-21.5 h), and duration of the complete intracellular cycle (96-215 h). Strong correlations were demonstrated between these characteristics as well as to the growth rate of the epimastigote stage of the same clones grown in liquid medium. These data demonstrate that the marked heterogeneity of the natural population of T. cruzi extends to the intracellular cycle of the parasite and has important implications for our understanding of Chagas' disease.
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Engel et al. (1985) studied this question.
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