N → a plural of apex
Current models of stem cell biology assume that normal and neoplastic stem cells reside at the apices of hierarchies and differentiate into nonstem progeny in a unidirectional manner.
流行的干细胞生物学理论认为，正常干细胞以及肿瘤干细胞位于细胞层阶的最顶端，单向分化为非干细胞的子代细胞。
The apices of the lungs get proper oxygenation.
肺脏的顶部得到适当的氧合作用。
The primary site of Al toxicity locates in root apices.
铝毒害的最初作用位点在根尖。
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