The pith of this stemlike stele appears rather strongly like collenchyma tissue . 茎状中柱的髓显得颇强健，像厚角组织。
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These fresh insights , in turn , have led to the discovery of similar hierarchies among cancer cells within a tumor , providing strong support for the theory that rogue stemlike cells are at the root of many cancers 这些知识让科学家发现到，肿瘤内的癌细胞也有著类似的层级结构，为干细胞引发癌症的理论提供了支持证据。
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