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Basal citrullination (A), human endogenous peptidyl arginine deiminase (PAD) (B), and P. gingivalis peptidyl arginine deiminase (PPAD) (C) activities in GCF samples from patients with rheumatoid arthritis without (RA/non-PD) and with (RA/PD) periodontitis, and from individuals without rheumatoid arthritis without (non-RA/non-PD) and with (non-RA/PD) periodontitis, including significant differences (Mann–Whitney test).
