Table 1.

Morphological features of TH labeled neurons in the tree shrew striatum.

Cell type	Average size (cross-section; μm2)	Shape, processes, and staining	Mean percentage of total TH-ir cells (%)
Very small	20.47 ± 9.92	Oval to polygonal. Several thin processes. Staining moderate, rarely granular.	69.6 ± 3.11
Small to medium	73.12 ± 17.66	Round to polygonal with one process frequently observed. Rarely several processes. Staining from strong smooth to granular.	29.11 ± 3.27
Large to very large	259.63 ± 161.95	Round to oval with one process visible. Smooth strong labeling.	1.25 ± 0.16

TH immunoreactivity cells in the dorsal striatum were counted and classified in a total of two complete series of striatal sections from two different adult male tree shrews. Each series was composed of sections 300 μm apart and a total of 17 sections were studied per animal.