the effects of apomorphine and excape learning were examined in normal developing rat pups and littermates preferentially depleted of brain dopamine by the intracisternal administration of 6-hydroxydopamine ( 6-ohda ) at 5 days of age , a treatment which resulted in a rapid and permanent reduction in brain dopamine to concentrations 12-29 % of littermate controls while norepinephrine was not significantly altered .
C0006104
brain
C0086045
concentrations