ELECTRON MICROSCOPY: GASTROINTESTINAL: GI: DUODENUM: GOBLET CELL, labeled.; Scanning Electron Micrograph, GOBLET CELL, color. YELLOW ARROWS = PROCESSES OF THE PLASMA MEMBRANE OF LATERAL SURFACE OF CELL THAT INTERDIGITATE WITH SURFACE OF ADJACENT CELL, CYAN ARROWS = REGION OF TERMINAL BAR (CELL JUNCTIONS)