CD4 and pulmonary arterial hypertension: Differently, a previous study observed significantly higher proportion of naive CD4+ T cells and central memory T cells but lower proportions of cytotoxic T cells, exhausted T cells, type 17 T helper cells, effector memory T cells, NK T cells, NK cells, γδT cells, and CD8+ T cells in PAH by another tool ImmuCellAI (Immune Cell Abundance Identifier) [31].