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Multiplication of L. dumoffii in MM6 coincubated with supernatant obtained from a coculture of L. dumoffii- or L. steigerwaltii-infected MM6 with uninfected A. castellanii. Control, coculture supernatant from uninfected MM6 and A. castellanii. Data are means ± 95% confidence limits from three experiments. ∗, P < 0.05; ∗∗, P < 0.01.
