In a second set of experiments, peripheral blood samples from another subgroup of children with CHD and non-CHD controls were subjected to in vitro stimulation with IL-2 and HMBPP, the latter known to be a potent activator of the Vγ9Vδ2+ TCR29,30,45,46, or IL-2 alone. The gene discussed is IL2; the disease is coronary artery disorder.