Effect of MK-0626 and/or GLP-1 on GFR and RBF. GFR, glomerular filtration rate. RBF, renal blood flow. a and c, effects of saline+GLP-1 on GFR and RBF, respectively. b and d, effects of MK-0626+GLP-1 on GFR and RBF, respectively. *p < 0.05 vs. baseline. Baseline refers to the 20 minutes period prior to IV administration of saline or MK-0626.