Rat skeletons are not like humans' either. They maintain growth plates throughout their lives. While they do eventually stop growing, the evolutionary potential is still there. ROUSes are a distinct possibility.
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Incidentally, the reason you cite is also the reason rats are used for cancer studies. In the wild, they don't live long enough to develop cancer, generally speaking. Lacking any selective pressure against it, they tend to have quite high incidence of cancers we can study.
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