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. 2014 Sep 18;9(9):e107119. doi: 10.1371/journal.pone.0107119

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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.

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Based on the regression line of the comparative egg PG data, Cluster 1 represents the experiments with a linear increasing relationship between ln(CPM) and ln(concentration) of egg PG, Cluster 2 represents the experiments with a non-linear decreasing relationship between ln(CPM) and ln(concentration), Cluster 3 represents the experiments with a flat, quadratic relationship between ln(CPM) and ln(concentration), and Cluster 4 represents the experiments with a decreasing step function between ln(CPM) and ln(concentration), respectively. Those PG species exhibiting a statistically significant difference from egg PG (either a greater or lesser effect) are marked by asterisks. The number of different experiments for which the egg PG comparator was performed is indicated.