The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z

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Willem Rens^*, Patricia CM O'Brien, Frank Grützner, Oliver Clarke, Daria Graphodatskaya, Enkhjargal Tsend-Ayush, Vladimir A Trifonov, Helen Skelton, Mary C Wallis, Steve Johnston, Frederic Veyrunes, Jennifer AM Graves and Malcolm A Ferguson-Smith