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The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z.
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, Malcolm A Ferguson-Smith
OAI: oai:www.repository.cam.ac.uk:1810/238216