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Zhu WZ, Zheng M, Koch WJ, Lefkowitz RJ, Kobilka BK, Xiao RP.Zhu WZ, et al. Among authors: kobilka bk.Proc Natl Acad Sci U S A. 2001 Feb 13;98(4):1607-12. doi: 10.1073/pnas.98.4.1607.Proc Natl Acad Sci U S A. 2001.PMID: 11171998Free PMC article.