Correlation studies in Zucker rats. Correlative studies between body weight and enzyme activity in mature adipocytes isolated from each adipose tissue depot in abdominal (A,D), subcutaneous (B,E), and epididymal (C,F) adipocytes. When the Zucker diabetic rats were omitted from analysis, a significant correlation was observed between FAAH activity and plasma glucose levels in the abdominal (G) and subcutaneous (H) but not epididymal adipocytes (I). Stronger correlations were also seen between MGL activity and plasma glucose levels in all adipose depots (J,K,L). The Spearman correlation coefficient is reported. Key: green, lean rats; red, obese rats; black, obese diabetic rats.