Photomicrograph of the LC of DBHcre-TdTomato mice transduced with the virus AAV1-ChR2-eYFP showing co-localization of DBH positive neurons (Tomato red staining) and ChR2 expressing cells (eYFP green staining; scale bars: upper 50 µm, lower 20 µm). 89.9% of DBH positive cells co-expressed the ChR2-eYFP in the LC and DBH-Tdtomato cells could be detected in 97.2% of the ChR2-eYFP
expressing cells (n=3 mice).