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Comparative susceptibilities of the B6D2F1 progeny and the resistant female C57BL/6J (B6) and susceptible male DBA/2J (D2) parental strains. A dose of 500 spores/mouse of B. anthracis Ames was used for all inoculations of age-matched (6 to 8 weeks old) F1 progeny and parental strains. Survival time, expressed as TTD (in hours), is plotted as the mean and standard error of the mean. Abbreviations: M, male; F, female; n, number of animals tested for each strain.
