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Spencer JA, Hacker SL, Davis EC, Mecham RP, Knutsen RH, Li DY, Gerard RD, Richardson JA, Olson EN, Yanagisawa H.Spencer JA, et al. Among authors: yanagisawa h.Proc Natl Acad Sci U S A. 2005 Feb 22;102(8):2946-51. doi: 10.1073/pnas.0500058102. Epub 2005 Feb 14.Proc Natl Acad Sci U S A. 2005.PMID: 15710889Free PMC article.