IκBε is a key regulator of B cell expansion by providing negative feedback on cRel and RelA in a stimulus-specific manner. - Alves BN; Tsui R; Almaden J; Shokhirev MN; Davis-Turak J; Fujimoto J; Birnbaum H; Ponomarenko J; Hoffmann A (Journal of immunology (Baltimore, Md. : 1950), 2014)