EIF2AK2 and pulmonary arterial hypertension: Among these proteins, we selected HMOX1 (or HO-1) and IFIT3 for confirmation by the semi-quantitative Western blot approach to confirm these findings due to the importance of HMOX1 and EIF2AK2 (or PKR) in the pulmonary field [12] and due to the novelty of IFIT3 in the pulmonary hypertension field.