产生于针叶树类前胚的胚原细胞群顶端的特殊细胞，先端尖。由于前胚柄伸长而将胚原细胞群推进胚乳之际，帽细胞被认为是起着机械的作用。
基细胞和帽细胞都具有浓厚的细胞质。
Both of the basal cell and the cap cell have dense cytoplasm.
三名美国科学家因为发现了能在细胞分裂时防止染色体散裂的“保护帽”而赢得今年诺贝尔医学奖。
The discovery of a "protective cap" that prevents chromosomes from falling apart when cells divide has earned three American researchers this year's Nobel prize in medicine.
当这些微型染色体注入到酵母细胞中后，在细胞分裂时，这种CCCCAA的DNA序列在复制时对染色体起到了保护作用，就像鞋带末端的塑料帽对鞋带起到的防磨损作用。
When these were injected into yeast, the DNA sequence protected the chromosomes when they were copied, just as the plastic tips at the ends of shoelaces stop them from fraying.
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