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When can a stem cell become another cell type?

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What is special about a stem cell?

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Who is against stem cell research?

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What is the passage mainly about?

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What does the woman mean when she says the man’s brain will turn

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What does the man like to do according to the dialog?

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Where does this dialog probably take place?

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 What does the man finally decide to do?

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 What did David Copperfield do at the Great Wall of China, accor

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Which of the following DOESN’T the man mention?

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