Animal system (for example, Pan troglodytes)
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Human system
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a. Genes. >90% of nucleotide sequences identical.
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Exposure to HIV.
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State S1. Mild illness of limited duration.
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AIDS. State S1 is not shared despite the presence of shared, relevant properties.
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b. Immune system. Many commonalities. Constructed on generally the same plan.
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c. White blood cells present and function similarly.
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d. Receptors on white blood cells also present and function similarly.
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e. Shared intracellular components of white blood cells.
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