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A risk allele for nicotine dependence in CHRNA5 is a protective allele for cocaine dependence.
Grucza RA, Wang JC, Stitzel JA, Hinrichs AL, Saccone SF, Saccone NL, Bucholz KK, Cloninger CR, Neuman RJ, Budde JP, Fox L, Bertelsen S, Kramer J, Hesselbrock V, Tischfield J, Nurnberger JI Jr, Almasy L, Porjesz B, Kuperman S, Schuckit MA, Edenberg HJ, Rice JP, Goate AM, Bierut LJ. Grucza RA, et al. Biol Psychiatry. 2008 Dec 1;64(11):922-9. doi: 10.1016/j.biopsych.2008.04.018. Epub 2008 Jun 2. Biol Psychiatry. 2008. PMID: 18519132 Free PMC article.