Dopamine activates phospholipase C in discrete regions of the mammalian brain, and this action is believed to be mediated through a D1-like receptor. Although multiple lines of evidence exclude a role for the D1 subtype of D1-like receptors in the phosphoinositide response, the D5 subtype has not been similarly examined. Here, mice lacking D5 dopamine receptors were tested for dopamine agonist-...
