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Boutrel B, Kenny PJ, Specio SE, Martin-Fardon R, Markou A, Koob GF, de Lecea L.Boutrel B, et al. Among authors: koob gf.Proc Natl Acad Sci U S A. 2005 Dec 27;102(52):19168-73. doi: 10.1073/pnas.0507480102. Epub 2005 Dec 15.Proc Natl Acad Sci U S A. 2005.PMID: 16357203Free PMC article.