Figure 1.

Raw electrophysiological records (voltage vs time) showing responses to the prototypical stimuli in neuron no. 29 from B6 mice (A) and neuron no. 36 in 129 mice (B). The stimulus is indicated at the bottom left of each trace (abbreviations are as in Table 1), stimulus onset is indicated by the vertical bar underneath, the timescale is shown by the horizontal bar at the bottom right, and the waveforms for the counted spikes are superimposed in the box to the right of each trace. The neuron in A responded significantly to NaCl, HCl, and quinine, and the one in B responded significantly to sucrose, NaCl, and HCl.