The genetic composition of sex chromosomes has been deciphered, in part, through large-scale gene expression studies in different species. A new study in mice adds a missing piece of the puzzle: the composition of the X chromosome in mammals is influenced by inactivation of the sex chromosomes during male meiosis.
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Reinke, V. Sex and the genome. Nat Genet 36, 548–549 (2004). https://doi.org/10.1038/ng0604-548
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DOI: https://doi.org/10.1038/ng0604-548
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