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(a) Serum HO-1 levels were, respectively, higher in RA patients and AS patients than those in HCs. (b) Serum BMP-7 levels were, respectively, higher in RA patients and AS patients than those in HCs. (c) Serum Runx2 levels were not significantly higher either in RA patients or in AS patients than those in HCs. ∗∗ p < 0.01.
