Figure 2. Neurochemical content of the D1/D2 MSNs.
Transverse sections taken from the dorsolateral striatum of a D1/D2 transgenic mouse that were immunostained for enkephalin (ENK, a–d) or dynorphin (DYN, e–h). Thin arrows indicate D1 MSNs, thick arrows point to D2 MSNs and arrowheads to D1/D2 MSNs. The D1/D2 MSNs are immunoreactive for dynorphin but not for enkephalin in the D1/D2 transgenic mouse.