It is thought to be important for T 2 cells in particular .
CD278 or ICOS ( Inducible T - cell COStimulator ) is a CD28 - superfamily costimulatory molecule that is expressed on activated T cells .
ICOS is thought to be important for T 2 cells in particular .
CD278 or ICOS ( Inducible T - cell COStimulator ) is a CD28 - superfamily costimulatory molecule that is expressed on activated T cells .