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Mu opioid receptor A118G polymorphism in association with striatal opioid neuropeptide gene expression in heroin abusers.
Drakenberg K, Nikoshkov A, Horváth MC, Fagergren P, Gharibyan A, Saarelainen K, Rahman S, Nylander I, Bakalkin G, Rajs J, Keller E, Hurd YL. Drakenberg K, et al. Among authors: fagergren p. Proc Natl Acad Sci U S A. 2006 May 16;103(20):7883-8. doi: 10.1073/pnas.0600871103. Epub 2006 May 8. Proc Natl Acad Sci U S A. 2006. PMID: 16682632 Free PMC article.