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. 2011 Apr 29;6(4):e19163. doi: 10.1371/journal.pone.0019163

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Lee et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Lysates from articular chondrocytes of 6-, 21- and 30-month-old rats were used in kinase assays and quantified radioactivity determined using a β-counter. CK2 activity in the articular chondrocytes of 21- and 30-month-old rats was significantly decreased by 30% and 40%, respectively, compared to their 6-month-old counterparts (** P<0.01). Values are expressed as mean ± S.D.