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. 2009 Nov 19;108(4):1003–1010. doi: 10.1152/japplphysiol.00625.2009

Fig. 4.

Fig. 4.

In male rats, there were significant (P < 0.05) strain differences in the total number of neurons stained for Nissl substance (A) and in the number of K+ channel-immunoreactive (ir) neurons (B–D) in the medullary raphé nucleus between 0 and 2 mm rostral to obex. The total number of neurons was greater (P < 0.05) in the FHH strain than in the SS and BN strains. The number of neurons immunoreactive for all 3 pH-sensitive K+ channels was greater (P < 0.05) in the SS strain than in the BN and FHH strains. The post hoc test did not reveal any significant differences at specific distances rostral to obex. For the total and all 3 K+ channel-ir neurons, there was a significant increase (P < 0.05) between 0 and 2 mm rostral to obex.