HELPImmunology question Classify the events as possible precursors for a professional antigen presenting cell (pAPC) activating Signal 1, Signal 2, orSignal 3 in an interaction with a naïve CD4+ T cell. Not all of the events will be used.Signal 1MHC restrictionendogenous pathway of antigen presentationV(D)J recombinationlineage commitmentSignal 2Signal 3exogenous pathway of antigen presentationPRR signaling in pAPC activates CD80expressionPRR signaling in pAPC activates IL-2expressionAnswer BankIL-2α chain gene expression

1. Signal 1: 1. 4. Restriction on MHC Products: Specifically, this refers to the interaction that…

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