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Kleyn PW, Wang CH, Lien LL, Vitale E, Pan J, Ross BM, Grunn A, Palmer DA, Warburton D, Brzustowicz LM, et al.Kleyn PW, et al.Proc Natl Acad Sci U S A. 1993 Jul 15;90(14):6801-5. doi: 10.1073/pnas.90.14.6801.Proc Natl Acad Sci U S A. 1993.PMID: 8341701Free PMC article.