The microRNA, miR164, has been implicated in aging in Arabidopsis and was part of a complex genetic chain that changed as leaves aged.

其中MIR164这个微RNA，在Arabidopsis的衰老进程中被确认是一个复杂遗传链条的部分，那链条随着树叶的衰老而变化。

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Objective: to provide morphological basis for dental aging and senile teeth diseases and to study age-related changes of pulp-dentin complex of human premolar.

目的：研究人前磨牙牙髓牙本质复合体的增龄性变化，探讨牙衰老和老年牙病的形态学基础。

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The process is controlled by complex signalling pathways. Irregulation of autophagy is associated with such as several diseased states cancer, neurodegenerative diseases, and aging.

自噬的过程受一系列复杂的信号分子的调控，调控机制的失效与肿瘤、神经退行性疾病、衰老等有重要的联系。

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For years biologists have figured the aging process is so complex it must involve thousands of genes, too many to offer an effective targeted therapy.

FORBES: On The Cover/Top Stories

The U.S. continues to spend several billion dollars each year to maintain the nuclear weapon complex and the aging stockpile.

CENTERFORSECURITYPOLICY: Center For Security Policy

Part of the problem, according to the IG, is that the facilities of the nuclear weapons complex have been aging and need increased spending for maintenance and replacement.

CENTERFORSECURITYPOLICY: Center For Security Policy