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Spradling AC, Mahowald AP.Spradling AC, et al.Proc Natl Acad Sci U S A. 1980 Feb;77(2):1096-100. doi: 10.1073/pnas.77.2.1096.Proc Natl Acad Sci U S A. 1980.PMID: 6767241Free PMC article.