Immunohistochemical localizations of calcitonin gene-related peptide, catechol-0-methyltransferase and bradykinin receptor B1: Representative images showing localization of calcitonin gene-related peptide (Figure
1A), catechol-0-methyltransferase (Figure
1B) and bradykinin receptor B1 (Figure
1C) in annulus regions of the human disc. Figure
1D illustrates a negative control. Arrows mark nearby cells which did not show localization.