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T cell proliferation at different time-points after restimulation. PA cells were restimulated 4 days after the first stimulation. Proliferation was measured at different times after restimulation for 6 days. [3H]-thymidine uptake is given in cpm. □, 24 h after restimulation; 
, 48 h after restimulation; 
, 72 h after restimulation; ▪, 96 h after restimulation; 
, 120 h after restimulation; 
, 144 h after restimulation.
