Fig. 5. Effects of halothane ( A ) and isoflurane ( B ) on 3H-dopamine (DA) release rate stimulated by N -methyl-D-aspartate (NMDA; 10−3M) in striatal synaptosomes. Data (mean ± SD) are expressed as a fractional increase from basal release. * P < 0.05, ** P < 0.01 vs. NMDA-induced release.