Similarities in the composition of intermediate filaments between human ciliary and choroid plexus epithelia-correlation with similar secretory functions.

The ciliary epithelia of human fetal and adult eyes were investigated for the presence of intermediate filament proteins. Coexpression of cytokeratin and vimentin was found. This resembles the intermediate filament pattern of choroid plexus epithelium, another neuroepithelial tissue with secretory function.