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Columnar scatter plot of the quantitative expression of BDKRB2 in synovial tissue from patients with OA by genotype at the (a) +9/−9 and (b) −58T/C polymorphisms. n = the number of patients studied for each group. The horizontal lines in each plot represent the mean and the standard deviation (SD) of the mean. P-values were calculated using a two-tailed Mann–Whitney U-test
