Techniques for study of thoracic duct lymph and lymphocyte circulations in rats and in man are presented. Radiographic observations, measurements of lymph flow, lymphocyte output, blood lymphocyte level, intra-thoracic pressures and radioactive determinations in the lymph and blood of 51Cr labelled lymphocytes, indicate that the techniques are suitable for long-term study of thoracic duct circulations under physiologic conditions.
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