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. 2012 Aug 16;12:109. doi: 10.1186/1471-230X-12-109

Figure 5.

Figure 5

The frequency of PD1 expression on pentamers in T2 compared with which expressed on circulating CD8. During T2 period, the frequency of PD1 expression on pentamers were higher significantly than that of expressed on total circulating CD8 ( P core vs CD8 <0.05, Penv vs CD8 <0.05, P pol vs CD8 < 0.05 ).