Figure 2. Qualitative comparisons of hindgut morphology in fifth instar Periplaneta americana.

Exemplars from three wild-type (A), germ-free (B), and conventionalized (Conv.; C) P. americana individuals are presented. A magnified hindgut from a wild-type P. americana (D) is provided to highlight normal morphological features, including undulating gut margin highlighted by a thick white line and gut segmentation highlighted with thin dashed lines. Scale represents one mm.