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Small bone marrow lymphocytes, which had been previously enriched by velocity sedimentation, thymocytes, lymph node cells and spleen cells were electrophoretically separated, stained with fluorescein conjugated rabbit a-rat-Thy-1. globulin and their fluorescence intensities analyzed with a flow cytophotometer. Thy-1. antigens were found in 80% of the bone marrow small lymphocytes showing low electrophoretic mobility (EPM), in all thymocytes, about 80% of which show low and the rest medium to high EPM, and in a few lymph node cells of high EPM. Thy-1. positive cells were not observed in the spleen. All fluorescence intensity histograms obtained were modal and could be properly fitted with normal curves showing coefficients of variation (C.V.) in the range of 20% to 30%. It was observed that the thymocytes of low EPM had an antibody binding affinity significantly different from that of the other stained lymphocytes. Moreover the surface antigen density decreased in the sequence: thymocytes of low EPM, bone marrow lymphocytes of low EPM and thymocytes of high EPM. The fluorescence intensity of stained lymph node cells of high EPM appeared similar to that of thymocytes of high EPM but was not evaluated precisely. Thus the two dimensional cell analysis provided by a combination of EPM and surface fluorescence of Thy-1.+ cells, allows the characterization of different lymphocyte populations which cannot be clearly identified with normal one dimensional techniques. The biological significance of the results is discussed briefly.

Cytofluorometric analysis of R-Thy-1. antigens in various rat lymphocytes with different electrophoretic mobility and organ distribution.