Contraction of front and side parts as cells die off was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.

随着细胞的死亡，有些人大脑前部和侧部的收缩，在三十多岁时就能观察到，但是也有些人直到六七十岁依然不明显。

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Keratinocytes form several layers that constantly grow outwards as the exterior cells die and flake off.

角化细胞形成多层细胞层随着最外层的细胞死亡消失不断往外生长。

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Researchers isolated two proteins, known as CCSA-3 and CCSA-4, that appear to be released into the bloodstream when some of the cancer cells in a tumor die off.

研究人员分离出两种蛋白命名为CCSA-3和CCSA-4，这两种蛋白似乎在肿瘤一些癌细胞死亡后被释放入血流。

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However, there are problems with longer-term use, as the skin constantly produces new cells, while those at the surface die and are brushed off, meaning a new sensor would need to be attached at least every fortnight.

BBC: Health