Might systemic autoimmune Dz related anti-protein arginine methyltransferase 5 (PRMT5). ELISA study of 33 SSc, 87 RA, & 31 controls. Vs controls, anti-PRMT5 Abs seen in SSc (48% vs 0; AUC 0.9) & RA (15% vs 0; AUC 0.768). PRMT5 Abs signif assoc w/ ILD & ANA positivity. https://t.co/svjjtQQsIY