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Left, levels of resistance to oryzalin displayed by the Toxoplasma lines selected in 0.5 μM oryzalin (horizontal gray line). Most lines selected for resistance to 0.5 μM oryzalin showed only slight resistance to increased oryzalin. Right, Toxoplasma lines selected in 2.5 μM oryzalin (horizontal gray line). Most lines selected for resistance to 2.5 μM oryzalin were highly resistant to increased oryzalin.
