in this paper the effect of preincubation of responder or stimulator cells in sf has been studied : ( 1 ) when unprimed responders are preincubated with the suppressor supernates ( sf ) and tested in mlr i against several stimulators , the cells of the autologous sf producer and certain other allogeneic cells are always inhibited as already observed when sf was added directly to a mixed lymphocyte culture .
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the cells
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allogeneic cells