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Metabolic activation stimulates acid secretion and expression of matrix degrading proteases in human osteoblasts (George M, Stein B, Müller O, Weis-Klemm M, Pap T, Parak W J, Aicher W K. Ann Rheum Dis 2004;63:67–70.)
We regret that in fig 1B⇓ of this article the lines joining the data points did not appear in the shaded area of the figure. The correct figure is shown below.