“…D 2 -like DA receptors have been detected on sensory afferents, MCs, and interneurons (Nickell et al, 1991;Coronas et al, 1997;Duchamp-Viret et al, 1997;Davila et al, 2003;Gutièrrez-Mecinas et al, 2005). On sensory afferents, D 2 -like receptors have been detected in mammals (Nickell et al, 1991;Coronas et al, 1997;Gutièrrez-Mecinas et al, 2005) but not in amphibians (Duchamp-Viret et al, 1997), suggesting that effects of DA on sensory input differ between species. In mammals and turtles, DA or agonists of D 2 -like receptors reduced MC responses to olfactory nerve stimulation via a presynaptic mechanism and decreased presynaptic calcium influx into sensory axon terminals (Hsia et al, 1999;Wachowiak and Cohen, 1999;Berkowicz and Trombley, 2000;Ennis et al, 2001;Maher and Westbrook, 2008).…”