Figure 5: Double labeling of S100B and NeuN (by indirect immunofluorescence) in the cortex of Wistar rats. Arrowhead indicates NeuN-IR cell (green) and arrow indicates S100B-IR cell (red). Note that neurons (green NeuN-IR) are also not labeled with S100B-IR (red). This finding was true for the whole rostro-caudal axis. Scale bar: 100 μm.