STUDIES OF HUMAN ANTI-γ-GLOBULIN FACTORS REACTING WITH PEPSIN-DIGESTED γ-GLOBULINS

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Abstract
In vitro cultivation of murine spleen cells resulted in a spontaneous release of receptors for alloantigens. This was revealed by the capacity of cell-free culture supernates to recognize alloantigens as measured in the PAR assay. Qualitatively, recognition responses obtained with these supernates reproduced faithfully those found with the corresponding cells.