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Cross section of the glandular stomach of a chicken (HE): overview
The lymphoid tissue present in the glandular stomach (proventriculus) consists of mainly T lymphocyte aggregations. B lymphocyte follicles can be present. Some follicles however would consist of T lymphocytes.
There are three areas in which lymphoid tissue occurs: in the lamina propria of the folds, near the duct orifices and in the gland tissue.