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(A and B) Immunohistochemistry of SDHD+/+ (A) and SDHD+/− (B) carotid bodies. Tissues were incubated with an antibody to TH after which they were counterstained with hematoxylin for counting of nuclei. Note the cluster organization of glomus cells. (C) Percentage of TH-positive cells in the CBs of female mice (n = 3 for SDHD+/+; n = 6 for SDHD+/−). The asterisk indicates statistical significance (P < 0.05).
