Duplicated genes are common in genomes, perhaps because they provide redundancy: if one copy is inactivated, the other can still work. A new study quantifies the effects of deleting 'singletons' and duplicated genes in yeast.
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Meyer, A. Duplication, duplication. Nature 421, 31–32 (2003). https://doi.org/10.1038/421031a
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DOI: https://doi.org/10.1038/421031a
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