Specifically, the IH subgroup exhibited significantly higher proportions of CD8+ T cells and Treg cells, with median percentages at 3.9% and 5.5%, respectively, compared to 1.2% and 2.8% in the IM subgroup, and 0.2% and 1.6% in the IL subgroup. The gene discussed is CD8A; the disease is isolated hemihyperplasia.