ODOR DISCRIMINATION IN SINGLE TURTLE OLFACTORY RECEPTOR NEURON

To explore the ability of odor discrimination of olfactory receptor ne urons, current responses to odorant cocktails were recorded from an is olated olfactory neuron of the turtle. Twenty-five percent of the neur ons tested responded to both cAMP-dependent and the IP3-dependent odor ant cocktails. Application of the cAMP-dependent (or the IP3-dependent ) odorant cocktail to the neuron after an inward current induced by th e IP3-dependent (or the cAMP-dependent) odorant cocktail was adapted i nduced a large inward current in the neuron. The results suggest that at least two different receptors exist in a single olfactory neuron.