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freeair8358

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[求助] 急求答案,各位,老年小鼠和大鼠分别都是几周龄?谢各位

我想用老年的小鼠做实验,但不知老年小鼠应该选几周龄的。有哪位高人指点一下老年的大鼠和小鼠分别是几周龄的?多谢!
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