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. 2011 Jan 26;6(1):e15642. doi: 10.1371/journal.pone.0015642

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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A: measured calcium concentrations in cell media. B: normalized 24-hr survival of Jurkat in media with modified Ca content. Increasing the external calcium has a negative effect on cell survival. C: a logarithmic fit to data by dose and the predicted LD₅₀ values. (mean +/− s.e, n = 3).