The percent of 15 total marbles buried at least 75% after a 30 min test was not significantly different across sex or genotype. Black, grey, and white bars indicate the mean + S.E.M. for wildtype (female N=16, male N=16), heterozygous (female N=12, male N=16), and knockout mice (female N=23, male N=18), respectively. Black squares, grey diamonds, and white circles indicate individual data points for wildtype, heterozygous, and knockout animals, respectively.