Fig. 2.

l-Arg and citrulline arterial-renal venous (A-V) correlations with the l-Arg A-V difference shown as a negative number reflecting net l-Arg release by the kidney into the renal vein. Shown is the correlation between the citrulline A-V difference and l-Arg A-V difference in sham (r² = 0.8143, P < 0.0001; A), 1–2 wk postinjury (r² = 0.4925, P = 0.0026; B), 4–5 wk postinjury [r² = 0.1336, not significant (NS); C], and 10–12 wk postinjury (r² = 0.00007, NS; D). Scale is set from 0 to 150 on the x-axis, and samples lying outside this range are shown on the extended axis, with exact values in parenthesis. Linear regression analysis was performed on each correlation to obtain the r² and P values shown.