Fig. 1.
Effects of l-dopa on TPH+/NeuN+ cell counts in the DRN. Rats received 10 days of l-dopa or vehicle treatment. (A) Chronic l-dopa treatment significantly decreased TPH+/NeuN+ cell bodies (*P < 0.05 compared with vehicle, Student’s t test). (B) Representative DRN images (original magnification: 20×) illustrating TPH+/NeuN+ colabeling (green = NeuN+, red = TPH+, yellow = TPH+/NeuN+ colabel) (n = 9–11 per group).