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Schardl CL, An Z.Schardl CL, et al.Genet Eng (N Y). 1993;15:191-212. doi: 10.1007/978-1-4899-1666-2_9.Genet Eng (N Y). 1993.PMID: 7763840Review.No abstract available.
Tsai HF, Liu JS, Staben C, Christensen MJ, Latch GC, Siegel MR, Schardl CL.Tsai HF, et al. Among authors: schardl cl.Proc Natl Acad Sci U S A. 1994 Mar 29;91(7):2542-6. doi: 10.1073/pnas.91.7.2542.Proc Natl Acad Sci U S A. 1994.PMID: 8172623Free PMC article.