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Date: 2009-09-18 01:53:03Behavior Social philosophy Behavioural sciences Prosocial behavior Morality Ingroups and outgroups In-group–out-group bias Egalitarianism Ultimatum game Social psychology Game theory Group processes | Vol 454 | 28 August 2008 | doi:[removed]nature07155 ARTICLESAdd to Reading ListSource URL: aleph.fish.hokudai.ac.jpDownload Document from Source WebsiteFile Size: 251,77 KBShare Document on Facebook |