Fig. 3. CYP1A-immunoreactive (black) glial cells in the corpus cerebelli and the tectum mesencephali of the control juvenile lake trout. Note that the glial cell courses along the blood vessels, and the end feet (black arrow) and dendritic spines (grey arrow) are visible. Horizontal section (20 µm thick) is counterstained with hematoxylin nuclear stain (purple). Scale bars, 20 µm.