Abstract
Lympho-cytes obtained from rabbit thoracic duct were present in a diffusion chamber that was left in the peritoneal cavity of a mouse for 200 days. Several thousand small lymphocytes were observed in the chamber fluid and many more were attached to the millipore filter of the chamber. These latter lymphocytes were found in close association with histiocytes that apparently were derived from large lymphocytes. Since mitoses were not observed after 14 days, the presence of a long lived component in this lymphocyte population is indicated.

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