Abstract
Cells from rat spleen, lymph nodes, and thoracic duct were separated by countercurrent distribution in aqueous two-polymer phase systems containing dextran and polyethylene glycol. Lymphoid cells from the different organs gave distinct, highly reproducible distribution patterns. The yield of separated cells and their viability compared well with other methods of physical separation. The majority of the leukocytes was separated from erythrocytes. Cells with surface immunoglobulin were recovered in one side of the distribution, while thymus-derived lymphocytes as determined by indirect immunofluorescence and histochemical staining were found in all fractions. However, cells responding to PHA and Con A were concentrated in a small area of the distribution, indicating a separation of subpopulations of thymus-derived lymphocytes.
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