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| Homology as a unifying |
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| • | Homologous genes
and proteins |
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| – | Share common
evolutionary ancestor |
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| – | Shared structure
and function |
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| • | Sequences are
conserved |
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| – | Within families
of genes and proteins |
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| – | Across vast
phylogenetic distances |
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| • | Sequence
similarity implies homology |
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