FIGURE 1.

Custom-mounted illumination system. (A) Illumination system and relative spectra of LED sources. (B) When placed together (and not in separate compartments), mice exposed to blue illumination demonstrated light aversion by hiding behind each other; such behavior did not take place for yellow exposure. (C) Behavior test: mice are placed in half-illuminated boxes and allowed to move freely. As in the previous figure, mice exposed to blue illumination demonstrated a strong light aversion, as compared to the yellow one under which animals preferred to stay.