Motor discoordination. A, Footprints of GluRδ2flox/flox and GluRδ2flox/CrePR mice at 8 and 30 weeks after RU-486 administration. Ink was applied to the hindpaws of the mice. Scale bar, 2 cm. B, The rotating rod test. Rotarod performance of GluRδ2flox/flox (open circles; n = 15) and GluRδ2flox/CrePR (filled circles; n = 11) mice. Retention time on the rotating rod at 15 rpm was measured. Data are expressed as mean ± SEM. **p < 0.01, ***p < 0.001, Student's t test.