Abstract
Fractionation of spleen cells was performed on albumin density gradients. Larger cells localized in the low density fractions. 19S and 7S antibody producing cells against SRBC and Esch. coli endotoxin were found to be enriched in low density fractions; high density fractions being depleted of such cells. Antigen-sensitive cells for humoral antibody synthesis were studied in transfer system and were found to be enriched in the high density fractions. Cells initiating graft-versus-host reactions were also enriched in these fractions. The results suggest that the antibody-producing cells are physically distinct from the antigen-sensitive cells initiating humoral antibody synthesis and cell-mediated immunity as well.
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