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Bertram Brenig, Lilith Steingräber, Shuwen Shan, Fangzheng Xu, Marc Hirschfeld, Reiner Andag, Mirjam Spengeler, Elisabeth Dietschi, Reinhard Mischke, Tosso Leeb. Christmas disease in a Hovawart family resembling human hemophilia B Leyden is caused by a single nucleotide deletion in a highly conserved transcription factor binding site of the F9 gene promoter. Haematologica 2019;104(11):2307-2313; https://doi.org/10.3324/haematol.2018.215426.