Fig. 3.

Linear regression analysis between plasma vasopressin (VP) or log plasma VP versus plasma osmolality of control (A) and TRPV1^−/− (B) rats during infusion of 2 M NaCl. Correlational coefficients (r²) and slopes are reported for each plot. As expected, there was a significant correlation between plasma or log plasma VP concentrations versus plasma osmolality in control rats (P < 0.01). A significant correlation was found between plasma or log plasma VP levels versus plasma osmolality in TRPV1^−/− rats (P < 0.01).