T cell–specific genetic deletion of PD-1H showed a trend toward potent antileukemia effects, but it was not statistically significant (mean radiance in Lck-Cre+PD-1H fl/fl versus Lck-Cre – PD-1H fl/fl on day 34: 2.5 × 10 8 versus 2.2 × 10 7 , n = 6, P = 0.1) ( Figure 3D ).
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