Fig. 4. (A) Thickness of the proximal intestine mucosa and muscularis/serosa layers and (B) micrographs of the intestinal epithelium of fasted and fed Heloderma suspectum (1DPF). For details of meal treatments, see Fig. 2. Scale bars, 200 µm; Values in A are means ±1 s.e.m., N=3 for each fasted and fed treatment. Different letters above the bars denote significant differences between means (for P values, see text). For each fed treatment intestinal mucosa had significantly increased in thickness, whereas the muscularis/serosa layer did not change.