however , in immunofluorescent histochemical studies , the antibody cross-reacted with ddc-like immunoreactive structures , such as chromaffin cells of the adrenal medulla , the raphe nucleus , the substantia nigra , and the locus coeruleus of the brain of guinea-pigs , but not of rats , suggesting that these two decarboxylases share some antigenic structures .
C0023951
locus coeruleus
C0006104
brain