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壁虎断尾重生，蝾螈大脑自愈，哺乳动物中的兔子、山羊等也具备一定的再生能力。而人类、小鼠这类高等哺乳动物受伤后，往往只能结疤愈合，无法“原装”再生。为什么高等哺乳动物在进化过程中丢失了这些能力？这是生物学界的一大谜题。最近，科学家们在小鼠和兔子的“耳朵”上找到了关键线索。
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