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SYNOPSIS. The biologic characteristics of 4 strains of hartmannellid amoebae were compared. All contained cytoplasmic DNA, degraded thymidine to CO2 and killed chick embryos at 32 C. All except H. glebae secreted a lipogenic toxin and contained antigen(s) capable of sensitizing erythrocytes. A. castellanii, unlike the other 3, also killed chick embryos at 37 C. The Fernald strain of H. rhysodes differed from the other 3 in its higher cytoplasmic grain count of cells labelled with 3H‐thymidine and in its ability to induce the appearance of amoebic antigen within human cells. Increased nuclear labelling in the Fernald strain was observed with increasing concentrations of 3H‐thymidine.
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McIntosh et al. (1971) studied this question.
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