For selective expression of mGlu1(N264H) in Purkinje cells, a mixture of AAV-TRE-HA-mGlu1(N264H) and AAV-L7-GFP-IRES-tTA, termed AAV-L7-mGlu1CBC, was injected directly into the cerebellum of WT mice, and brains were fixed and sliced 8 days after viral infection. Here, GRM1 is linked to viral infectious disease.