In each case, the left-hand species changes from incorporating alanine ( A ) at a specific position within a protein in a hypothetical common ancestor deduced from comparison of sequences of several species, and now incorporates serine ( S ) in its present-day form.

In each case, the left-hand species changes from incorporating alanine ( A ) at a specific position within a protein in a hypothetical common ancestor deduced from comparison of sequences of several species, and now incorporates serine ( S ) in its present-day form.

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