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Dynamics of CTL during primary and secondary infections with wild-type (wt), PA224 knockout (PA k.o.), or NP366 knockout (NP k.o.) virus. The symbols denote data for CTL in mediastinal lymph nodes (MLN) after infection with the wild-type or NP366 or PA224 knockout virus from reference 1. No data are shown for the primary response, since MLN data are not available. However, spleen data agree with the finding that neither NP366 nor PA224 epitope knockout changes the CTL responses (1).
