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. 2016 Apr 4;6:23919. doi: 10.1038/srep23919

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In each round of PGG, control condition involves only the contribution stage (S1), punishment condition involves the contribution stage (S1) and punishment stage (S3), gossip condition involves the contribution stage (S1) and gossip stage (S2), gossip-and-punishment condition involves the contribution stage (S1), gossip stage (S2), and punishment stage (S3).