See Also: molecular clock(medicine)
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clock(2)(dictionary)
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clock(encyclopedia)

molecular clock (medicine)


molecular clock


This term has two separate uses.

1. <molecular biology> The rate of fixation of mutations in DNA and thus times the rate of genetic diversification.

2. <cell biology> A biological system capable of maintaining up a timing rhythm or pulse. All such clocks are thought to be entrained by a natural oscillator such as the diurnal rhythm.