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发表于:2018-12-05 / 阅读(98) / 评论(0)

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This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left. Now scientists at the Nation

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发表于:2019-02-13 / 阅读(108) / 评论(0)

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发表于:2019-02-17 / 阅读(61) / 评论(0)

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