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. 2013 Dec 2;8(12):e81779. doi: 10.1371/journal.pone.0081779

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© 2013 Sun 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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Nissl staining of cortex (A1-D2) and hippocampus (A3-D4) in each group are shown at two different magnifications (A1-D1, A3-D3: ×200, A2-D2, A4-D4: ×400). Cell counts per visual field (×400) found in the slides with Nissl staining on 15 and 30 days after CO poisoning (B). The values are means ± SDs. *P < 0.05 comparing to the NC group; ^#P < 0.05 comparing to the CO group and ^$P < 0.05 comparing to the O₂ group.