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发帖数: 1660 | 1 researchers discovered that elephants have extra copies of two cancer-
fighting genes: P53, which hunts for cells with miscopied DNA, and LIF6,
which obliterates the mutated cells before they can form a tumor. When
researchers checked the evolutionary record, they found that LIF6 became
inactive in elephant DNA millions of years ago, and then mysteriously came
back to life |
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