Extended Data Fig. 2: Representative images of viral injection sites and expression.
From: Reward behaviour is regulated by the strength of hippocampus–nucleus accumbens synapses

a, Low-magnification image of YFP fluorescence in ventral hippocampus. b, Blue inset from a. c, Low-magnification image showing YFP fluorescence in the NAc. Insets show overlap in labelling of D1R expression and YFP. This was repeated in mice used for optogenetic experiments. Scale bar, 100 μm.