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The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z.
Rens W, O'Brien PC, Grützner F, Clarke O, Graphodatskaya D, Tsend-Ayush E, Trifonov VA, Skelton H, Wallis MC, Johnston S, Veyrunes F, Graves JA, Ferguson-Smith MA.
Genome Biol. 2007;8(11):R243.
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