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Same domains and/or motifs are found in many proteins

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The same domains and/or motifs are found in many proteins. In fact, a protein's tertiary structure is more conserved (stays the same or similar over many generations) than its amino acid structure. Why would it be advantageous for tertiary structure rather than amino acid sequence to be more reliably conserved among proteins whose functions are similar ?

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It will be advantageous for the tertiary structure to be conserved rather than the amino acid sequence, since if a mutation occurs the amino acid sequence can change and because ...

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The expert examines the same domains and/or motifs being found in many proteins.

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