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D E Lopatin
Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109-0402.
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N Van Poperin
Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109-0402.
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D K MacCallum
Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109-0402.
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R F Meyer
Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109-0402.
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J H Lillie
Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109-0402.