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Capacity of nonantigenic peptides to cause positive selection. The six nonantigenic analogs from Table 1 were added at a concentration of 40 μM to RCs established with ANV/I-Ek or ANV/I-Ekhi as epithelial cells. The percentage of CD4 SP cells present in cultures with no added antigen has been subtracted (ANV/I-Ek, 0.4%; ANV/I-Ekhi, 6%).
