patients with parkinson 's disease and the `` '' on-off '' '' syndrome studied during an `` '' on '' '' phase ( under levodopa therapy ) and on another occasion after withdrawal of levodopa ( `` '' off '' '' ) demonstrated a significant change in the uptake of [ 99mtc ] -d , l-hm-pao in the caudate nucleus ( lower on `` '' off '' '' ) and thalamus ( higher on `` '' off '' '' ) .
C0030567
parkinson 's
C0023570
of levo