THY1 and infection: Given this versatility, it is reasonable to believe that the methods presented here could work on any strain of fluorescent protein-expressing mouse or rat, as well as other indicators (e.g., iGluSnFr in Ai85 mice) or optogenetic fusion proteins (e.g., Thy1-ChR2-YFP) or in non-transgenic animals with brain-wide infection by viruses such as PHP.B41,53.