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Transfection of primary T cells can be challenging. This protocol describes a method to transfect primary human naive CD4+ T cells with an AP-1 luciferase reporter using low-level activation by phytohemagglutinin (PHA) and electroporation, as published (Palin et al., 2013). This technique is a modification of one previously described by our group (Cron et al., 2013). Anyone wishing to transfect murine T cells should consult the publication by Cron et al., 2013. This technique may be adapted for other primary T cell types by optimizing the Neon electroporation conditions, as described in the text. Other luciferase or GFP reporters may be used, and will require optimization of the stimulation conditions for that particular reporter.