Table 1.

Striatal levels of DA from animals treated with saline or METH

Treatment	Time after treatment
	1 week	1 month	6 months	12 months
Saline	13.74  ± 0.66	14.06  ± 0.77	13.52  ± 0.58	13.81  ± 0.78
METH	6.39  ± 0.71*	7.25  ± 0.61*	10.84  ± 0.43*	12.70  ± 0.77

Levels are expressed as micrograms per gram wet weight of tissue. Values are mean ± SEM for 14–15 animals per group.

*p < 0.05 versus saline group at same time point (two-way ANOVA followed by Newman–Keuls post hoccomparisons).