這是每一隻狗心中的疑惑~主人為什麼要這樣?
DNA - Wikipedia, the free encyclopedia散步時... Grooves Twin helical strands form the DNA backbone. Another double helix may be found tracing the spaces, or grooves, between the strands. These voids are adjacent to the base pairs and may provide a binding site. As the strands are not symmetrically loca...
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