By James Swarbrick (PharmaceuTech, Inc, Pinehurst, North Carolina, USA), James C. Boylan (University of North Carolina, Chapel Hill, )
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By Renato Dulbecco (The Salk Institute, La Jolla, California, U.S.A.)
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By World Book
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By Smith, D., etc., Appleton, Richard E., McKenzie, J.M., Chadwick, D.W., Mattson, Richard H.
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