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. 2015 Nov 16;10(11):e0141961. doi: 10.1371/journal.pone.0141961

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© 2015 Dudiki 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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Fig 6 — Sperm extracts from proximal caput, distal caput and caudal regions of epididymis were prepared by sonication. The soluble fraction of the extracts that has been previously shown to contain the majority of sperm PP2A was analyzed for phosphatase activity with phosphorylase a as the substrate. The mean phosphatase activity (of n = 4 experiments each using different set of extract ±SEM) is expressed as mmol of PO4 released/minute/2x10⁵ sperm. The combined activity of PP1 and PP2A is shown as total phosphatase activity (black bars). PP2A activity was measured using 2nM OA (that is activity that was inhibited by 2nM OA) and PP1 activity by inhibition with I2 (activity that was inhibited by I2).