gene encoding a protein that is involved in basic cell metabolism found in all eukaryotes, for example citrate synthase. We’ll find the same gene in ourselves, as well as in seaweeds, mushrooms, trees and amoebae. Despite diverging somewhat in sequence over the incomprehensible number of generations that separate us from our common ancestor with trees, natural selection has acted to conserve its function, and thus its specific gene sequence. This is a beautiful illustration of shared ancestry, and the molecular basis of natural selection. What nobody expected is that such genes should
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