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Micrograph of regions analyzed under the microscope. (A) Section of a sample collected from the epithelial mucus 970-fold magnification). The photograph shows the main criteria for definition of the epithelial mucus layer: distance of less than 25 μm from the tissue surface, high transparency, and tidy fibrillar structure. (B) Magnification of the central mucus and the bordering 25-μm layers of luminal mucus and epithelial mucus.
