Digital illustration of an epithelial cell layer in a tubular arrangement. Light blue polygonal cells are arranged around a central white space, labeled “Lumen.” One cell is magnified within a pale pink circle, revealing internal details. The apical surface has red/pink microvilli. Organelles are rendered in various shades of blue line art. Text labels identify the “Apical surface” and “Basolateral surface.” The background is plain white.

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