A study is made of the structure of lymph nodes removed at autopsy and at the time of surgery from patients with non-neoplastic diseases. The lymph node structure is evaluated by means of H&E and ammoniacal silver staining. A variety of recognizable patterns are identified and designated as: control, non-immune phagocytosis, recognition, reactive, immune SH and degenerative syncytial histiocytosis. The findings are discussed in terms of antigen-induced reactivity and antibody synthesis.

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