Correlation analysis of plasma nitrite or nitrate with RBC S-nitrosothiols. Each data point represents measurements of plasma nitrite (A) or nitrate (B) made from samples collected from an individual animal. □ indicates control; ○, LPS for 5 hours; ⋄, LPS for 10 hours; ▵, CLP for 5 hours; and ▿, CLP for 20 hours. Line shown is best fit line determined by linear regression. Correlation coefficients (R) and statistical P values are shown in respective figures.