The antibody-induced redistribution of ß2-microglobulin (ß2-µ) and HL-A antigens on the surface of living lymphocytes was studied by immunofluorescence. When all ß2-µ was redistributed on the lymphocyte membrane by specific rabbit antibodies and goat antirabbit Ig conjugates, the HL-A antigens were no more detectable with anti-HL-A conjugates outside the ß2-µ caps already formed. However, the redistribution of HL-A antigens fails to provoke the redistribution of all detectable ß2-µ molecules. These results suggest that HL-A antigens may be associated with ß2-µ at the cell surface, but that all ß2-µ molecules are not bound to HL-A antigens.

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