nuri77Distinguishing true Ag-stimulated lymphocytes from bystanders activated by the inflammatory milieu has been difficult. Nur77 is an immediate early gene whose expression isGeneration of MCK-Nur77 mice and animal husbandry. The murine Nur77 coding sequence was PCR amplified and cloned into the EcoRI site of the pCK4800 plasmid (gift of Eric Olson).The