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Figure 4 The levels of cFBG measured by cF16.1‐AMC sandwich ELISA. All the samples were tested at 1:25 and the cut off line for sensitivity was 400 ng/ml. Signals for cFBG were detected in 11/15 RASFs, while all of the RA plasma (n = 27) and OASF samples (n = 5) were below the level of detection.
