Bird-like sex chromosomes of platypus imply recent origin of mammal sex chromosomes.
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Veyrunes F, et al. Among authors: rens w.
Genome Res. 2008 Jun;18(6):965-73. doi: 10.1101/gr.7101908. Epub 2008 May 7.
Genome Res. 2008.
PMID: 18463302
Free PMC article.