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. 1998 Dec;57(12):742–746. doi: 10.1136/ard.57.12.742

Figure 1  .

Figure 1  

Effects of ferric citrate and sodium citrate on the PGE2 production by human synovial cells stimulated without or with different concentrations of IL1β. Data are the mean (SEM) of six separate experiments using cells from different patients. * p < 0.05, ** p < 0.01 compared with medium alone.