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Scattergrams showing OD values to native (ANCRF) and deiminated (ACRF) filaggrin, and the OD difference (dACRF) given by sera from RA patients (subgroup 1a) and controls (subgroup 1b) in the rat filaggrin ELISA. RA, rheumatoid arthritis; ANCRF, anti-non-citrullinated rat filaggrin; ACRF, anti-citrullinated rat filaggrin; dACRF, autoAb recognizing citrullinated minus noncitrullinated rat filaggrin; OD, optical density.
