if genetic variation of mesencephalic th activity is entirely attributable to variation in number of mesencephalic dopamine ( da ) neurons , identification of the genetic sources of variation of mesencephalic th activity may take us a step closer to animal models and preparations that are needed in the study of the physiological and constitutional mechanisms of human disorders in which da neurotransmission is involved .
C0027882
neurons
C0027793
neurotransmission