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Understanding amino acids and its relation to a biological clock

How do amino acid sequences function as a "biological clock?" This process is described.

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The genome of any species gradually accumulates genetic errors through the generations. While there is some redundancy in the genetic code, eventually these genetic errors manifest themselves into amino acid substitutions in proteins.
<br>So, over time, two species diverging from one common ancestor will begin to pick up differences in the amino acid sequences of certain proteins.
<br>If we assume ...

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This job reiterates amino acids and the relation to a biological clock.