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Real FX, Furukawa KS, Mattes MJ, Gusik SA, Cordon-Cardo C, Oettgen HF, Old LJ, Lloyd KO.Real FX, et al. Among authors: lloyd ko.Proc Natl Acad Sci U S A. 1988 Jun;85(11):3965-9. doi: 10.1073/pnas.85.11.3965.Proc Natl Acad Sci U S A. 1988.PMID: 2453881Free PMC article.