The nature of epithelial proliferation in apical granulomas

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Abstract
: Small sections of granulomas containing proliferating epithelium were incubated with a radio‐opaque marker (Thorotrast®) and tissue culture medium. Electron microscopic examination demonstrated that some epithelial cells had the potential to take up the marker whereas in control sections of apical cysts this did not occur. The implications of these results are discussed.