Gad2-ires-Cre, Rosa26-lsl-L10GFP mice were injected in the area postrema with an AAV containing a Cre-dependent ChR2-mCherry allele (AAV-Flex-ChR2-mCherry); post hoc histological analysis confirmed that viral infection was largely restricted to the area postrema (Figures 1A and 1B). The gene discussed is GAD2; the disease is viral infectious disease.