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Apicomplexan parasites, including the human pathogens Toxoplasma and Plasmodium , contain a vestigial plastid, the apicoplast. This chloroplast-derived organelle is the remnant of a secondary endosymbiosis between an ancestral apicomplexan and a photosynthetic organism whose origin is moot ([1–4][
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Funes et al. (2002) studied this question.
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