in parkinson 's disease patients , however , the d1 receptor density was elevated , with values of 22.8 +/- 1.2 pmol/g ( in patients not receiving l-dopa ) and 19.6 +/- 1.5 pmol/g ( in patients receiving l-dopa ) compared to the age-matched control density of 16.0 +/- 0.4 pmol/g .
C0030567
parkinson 's disease
C0023570
l-dopa