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Unique “Orphan Genes” Are Widespread; Have No Evolutionary Explanation

We often hear about the similarities between genomes, but what about the differences?  There’s a growing realization that groups of animals have genetic orphans – genes that are unique to that line (see 01/02/2003).  These genes have no evolutionary homology or kinship to genes from other lineages.  How did they arise?  And what do they […]
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