Regional brain cholecystokinin changes as a function of rough-and-tumble play behavior in adolescent rats. Burgdorf, J., Panksepp, J., Beinfeld, M. C., Kroes, R. A., & Moskal, J. R. Peptides, 27(1):172–177, 2006. PMID 16143427
Regional brain cholecystokinin changes as a function of rough-and-tumble play behavior in adolescent rats [link]Paper  doi  bibtex   

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