Fig. 2.

Modulation of tyramine (TA) responses by cGMP. A and B: TEP recordings of MTs bathed in saline and treated with 2 20-s applications of 10 nM TA separated by treatment with either 1 mM cGMP (A) or saline (B). C: mean amplitude of responses to different doses of TA before and after treatment with 1 mM cGMP. P values indicate significant differences of the second response from the first by paired t-test; n = 6–10 tubules per condition. D: mean responses to 10 nM TA before and after treatment with 1 mM cAMP, showing no significant change in the response by paired t-test; n = 8 tubules. Error bars indicate SD.