There is overwhelming evidence that the tumor clone including brain tumor is heterogeneous with respect to both morphology and function, which indicates differentiation potential of tumor stem cells.
大量事实表明，包括脑肿瘤在内，所有肿瘤细胞群落之间在形态和功能上存在很大差异，其异质性与肿瘤干细胞的分化潜能有关。
Natural environments are not uniform but heterogeneous, and genetic differentiation is an important strategy for organisms to cope with heterogeneous habitats.
环境的异质性是绝对的和普遍存在的，种内遗传分化是物种适应异质生境的重要对策。
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