NOS2 and pulmonary fibrosis: In the core network c, we found 11 direct targets, VCAM1, RELA, CDK2, JUN, CDK1, HSP90AA1, NOS2, SOD1, CASP3, AHSA1, PTGER3, which had the greatest correlation with Astragalus polysaccharides in treating pulmonary fibrosis.