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Helen R. Jervis, Mary M. McLaughlin, Merrill C. Johnson, Effect of Neutron-Gamma Radiation on the Morphology of the Mucosa of the Small Intestine of Germfree and Conventional Mice, Radiation Research, Vol. 45, No. 3 (Mar., 1971), pp. 613-628
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Jervis et al. (1971) studied this question.
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