Figure 3. The effect of altering the either the polar head or lipophilic tail on fatty acid-induced CCK secretion.

Comparison of the ability of dodecanoic acid (▪), undecanesulfonic acid (▴; A), dodecanamide (▴; B) or 1-undecanesulfonamide (♦; B) to induce CCK secretion in STC-1 cells exposed for up to 60 min with each fatty acid or to the ethanol vehicle control (□). Determination of CCK secretion is described in Fig. 2. Each data point represents the mean ±s.e.m. of four and five experiments for A and B, respectively.