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In homozygotes of both mouse lines [(a)R552 H and (b)S321 X], DCs of high-, medium- or low-noise content occurred at similar rates of about 30%. Wild-type and heterozygous animals of both mouse lines produced more high-noise than medium-noise or low-noise DCs; the wild-types also more medium-noise than low-noise DCs. Sounds of 10–12 animals per group could be analysed (see numbers in the top row of the figure).
