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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.

Figure 1

Activation of proton secretion in osteoblasts upon stimulation by PMA or TNF.

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