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. 2012 Feb 10;7(2):e32029. doi: 10.1371/journal.pone.0032029

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Cheng et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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COHb levels were measured immediately following 3-hour exposure (0 hours after exposure), 24 hours post exposure, and 72 hours post exposure in separate cohorts. Values are expressed as percentage (%) COHb means plus standard deviation. N = 8 animals per cohort. *P<.001 vs. all cohorts. † P<.05 vs. all 0 ppm cohorts. ‡ P<.05 vs. 0 ppm 24, 72 hrs. # P<.05 vs. 100 ppm 72 hrs.