Lymph nodes, from 15 patients undergoing surgery for conditions not related to lymphoid tissue disease, have been examined with the electron microscope. The human lymph node cell types—including lymphocytic, reticular and plasma cells—have been described at low and medium electron microscopic magnifications, and the criteria for their identification are discussed. The characteristic features outlined for identification of these cell types provide a basis for comparison with pathologically altered lymph node cells.

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