NR4A3 and pulmonary arterial hypertension: To further corroborate our research, MCT‐PAH rat pulmonary artery tissues were used to test the mRNA and protein level of NR4A3 in vivo (n = 5), as it did align in cell experiments, the results unveil that NR4A3 represents higher expression than the control group (n = 5; Figure 6E).