considered in physiological terms , we suggest that in addition to the amount of i-a antigen present on antigen-presenting cells , turnover and shedding of i-a antigens may be important for the stimulation of an immune response by allogeneic cells and in allowing a cell with receptors for foreign antigen ( x ) as well as for self i-a to find antigen x on i-a antigen-bearing cells .
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allogeneic cells
C0007634
cells