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(Top) Electron micrograph of a cross section through the anterior stroma of the human cornea. Collagen lamellae are alternated and undulated. The different collagen bundles cross sectioned (*), longitudinally sectioned (arrowhead), and obliquely sectioned (x) alternate at irregular distances. (Bottom) Electron micrograph of the posterior stroma shows strictly alternating cross sectioned (*) and longitudinal sectioned (arrowhead) collagen bundles at more or less regular distances.
