More biomarkers predictive of conversion to clinical RA in at-risk pts Serum PAD4 & PAD 4 levels measured in CCP+ at-risk individuals -PAD4 (not PAD2) increased in RA Converters vs. non converters and HC -PAD4 levels Pre-RA = RA Within high CCP+ at risk individuals, higher https://t.co/LU5zUzui1G