Fig. 3.
Parvalbumin labelling in Betz cells. a Parvalbumin-immunopositive (thick arrow) and parvalbumin-immunonegative (thin arrow) Betz cells on confocal fluorescent images with 20 × magnification. The parvalbumin expression of the Betz cells is lower compared to interneurons (one PV-immunopositive interneuron is indicated with a white star). b The proportion of PV-immunopositive and -negative cells in four control subjects in both hemispheres