Cytoplasmic intermediate filaments provide mechanical strength to cells. Not essential protein. Component of the terminal web (organelle-depleted, intermediate filament-rich layer of cytoplasm that underlies the apical microvilli of polarized epithelial cells) in embryonic through to adult gut cells. Correct localization of filaments requires let-413. Expression is restricted to a discrete circumferential subapical layer within the intestinal terminal web (known as the 'endotube'); this layer joins directly to the apical junction complexes that connect adjacent gut cells. Lima bean stage of embryogenesis into adulthood. Belongs to the intermediate filament family.