Figure 7. OEH I immunostaining in the stomatogastric nervous system and gut of fourth instar larvae and adults. Detail of immunostained axons (arrowheads) branching over the anterior stomach of an Aedes aegypti larva. Immunostained axons (arrowheads) in the esophageal nerves branching over the cardiac valve of an Anopheles gambiae larva. Ring of immunostained endocrine cells (arrowheads) in the cardiac valve of an An. gambiae larva. Immunostained axons (arrowheads) branching over the anterior midgut of a four day old Ae. aegypti female. Immunostained endocrine cells (arrowheads) in the posterior stomach of an An. gambiae larva. Immunostained endocrine cells (arrowheads) and axons (arrows) in the posterior midgut of a four day old Ae. aegypti female. Immunostained axon net (arrowheads) around the pyloric valve with a pair of axons (arrows) extending along the hindgut (HG) of a five day old An. gambiae female. MG, midgut. Top or right of figure, anterior or dorsal. Scale bar = 20 µm for A and F; 40 µm for B-E and G.