Circadian Rhythmicity in the Sensitivity of Two Strains of Mice to Whole-Body Radiation

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Science  17 Jul 1964:
Vol. 145, Issue 3629, pp. 286-291
DOI: 10.1126/science.145.3629.286


When male mice of the Swiss-Webster and C3H strains are maintained on a light-dark cycle in which the light begins at 7 a.m. and ends at 7 p.m., they are more sensitive to whole body x-irradiation (800 to 900 roentgens) given at 2 a.m. than at any other time in the cycle tested.

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