Scientists say that, by bathing the skin cells in extracts of immune cells, that human skin cells in a test tube are made to behave as if they were immune system cells.
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Athat human skin cells in a test tube are made to behave as if they were
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Bthat human skin cells were to behave in a test tube as if they were
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Chuman skin cells in a test tube were made to behave as if
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Dthey have made human skin cells in a test tube that were behaving as
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Ethey have made human skin cells in a test tube behave as if they were
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正确答案: E