In June, 1938, a woman who raises mice for her own amusement brought to one of us (Gruneberg) a dancing adult female mouse which had been given to her by a schoolboy.The mouse was of the Mus musculus type and not appropriate to keep with her waltzers which were Mus bactrianus.It was, however, pregnant, she claimed, by one of her genuine Japanese waltzers, yet the litter consisted of three perfectly normal animals, thereby indicating that the mutation was distinct from waltzing.
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Grüneberg et al. (1941) studied this question.