Accordingly, the mRNA levels of TGF-β1 correlated closely with PDGF-B both in healthy controls (p = 0.0268, r = 0.33; Fig. 2b) and in SLE patients (p < 0.0001, r = 0.61; Fig. 2f). The gene discussed is PDGFB; the disease is systemic lupus erythematosus.