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Avoid skin cancer (避免皮肤癌)

Updated at: 2018-12-01 新题 预测 机经题

The early bird gets the worm -- and may avoid skin cancer. Because a new mouse study that, for humans, tanning in the mornings may be less likely to permanently damage DNA and cause skin cancer. A mouse’s levels of the DNA-repairing protein XPA are different from ours -- they peak in the morning and bottom out in the evening. Researchers exposed mice to UV radiation when their XPA was at its minimum level, around 4 a.m., and others to the same rays around 4 p.m., when XPA levels peaked.
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