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Blood pH and pCO2 (mean ± 1 SD) of live (anesthetized; n = 4), CD-euthanized (n = 5), and CO2-euthanized (n = 5) female mice. *, Values significantly (P < 0.0001, one-way ANOVA) different. The testing system had a lower limit of 6.5 for pH and an upper limit of 130 mm Hg CO2.