PRTN3 and rheumatoid arthritis: Interestingly, we observed a decreased risk of developing ACPA-positive RA associated with serine and glycine residues (i.e., serine, ORcumulative 0.49, p < 0.00001, I2 =0%; glycine, ORcumulative 0.68, p < 0.002, I2= 0%) (Supplementary Figure.