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Cross section of the thoracic part of the esophagus of a chicken (HE): detail of a tonsillar unit (4)
The lining surface epithelium and epithelium of the glandular ducts is infiltrated with lymphoid cells which results in the formation of a lymphoepithelium.
The lymphoid tissue in the lamina propria consists of primary and secondary follicles of B lymphocytes, divided by interfollicular areas of T lymphocytes. High endothelial venules (HEV) are present in these areas.