Supplemental Figure 2
![Supplemental Figure 2](http://media.springernature.com/full/springer-static/image/art%3A10.1007%2Fs11689-009-9025-8/MediaObjects/11689_2009_9025_Fig7_ESM.gif)
Visual cliff tests on the Dlx1−/− mice did not detect deficits in vision, as shown by the mean (±SEM) of percentage of time spent in the area with high-contrast gratings in normal light (p = 0.34). Similarly, mutant mice did not show significantly different behavior from the control mice in the dark conditions with red light ((p = 0.30). In both conditions, there was a trend for mice to spend more time in the high-contrast area, but this observation is confounded with the experimental procedure that all mice were placed in the high-contrast area at the start of the experiment. Dlx1+/+, n = 5; Dlx1−/−, n = 4.