Figure 1
From: Circadian rhythm of glycoprotein secretion in the vas deferens of the moth, Spodoptera littoralis
Carbohydrates in the reproductive system of S. littoralis. a. Section of the UVD showing sperm bundles (green arrows) penetrating through the epithelial barrier into the UVD lumen. Pinkish, PAS-positive material is present among sperm in the lumen (blue arrow) and in the apical region of the UVD epithelium. b. Higher magnification of the apical region (delineated by black rectangle in a). Distinct secretory granules (black arrows) are visible in the cytoplasm and strands of PAS-positive material (blue arrows) are visible in the lumen.