FCGR2B and pulmonary arterial hypertension: As can be seen from Table 7, the immunoregulators homologous to the rat Fcgr2b gene are excessive in all tissues of all ARD-affected subjects (humans and animals) with only one exception: FCGR1B deficiency in the lungs of a patient with fibrosis in pulmonary arterial hypertension [39] (Table 7: line #12).