ELECTRON MICROSCOPY: GASTROINTESTINAL: GI: STOMACH: Epithelium-connective tissue junction and blood vessel. (EM-labeled); RCH/Prospect1179, stomach (sheep rumen), note complex basal epithelial surface of this absorptive epithelium.` 1-epithelial cell nucleus, 2-epithelial basal lamina, 3-elastic tissue, 4-capillary (or venule) lumen, 5-endothelial basal lamina