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

Willem Rens¹ , Patricia CM O'Brien¹ , Frank Grützner² , Oliver Clarke¹ , Daria Graphodatskaya¹ , Enkhjargal Tsend-Ayush² , Vladimir A Trifonov^1,3 , Helen Skelton¹ , Mary C Wallis¹ , Steve Johnston⁴ , Frederic Veyrunes¹ , Jennifer AM Graves⁵ and Malcolm A Ferguson-Smith¹

¹Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 OES, UK

²School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, 5005 SA, Australia

³Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosobirsk, Russia

⁴School of Animal Sciences, Currumbin Sanctuary, Queensland University, Brisbane, QLD 4072, Australia

⁵Research School of Biological Sciences, The Australian National University, Canberra, ACT 2601, Australia