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Immunohistochemical localization of GC-C (A, B), cGKII (C), CFTR (D, E), and AE2 (F) in the human parotid gland by the avidin-biotin-peroxidase complex technique. Note that immunoreactivity for all components is exclusively confined to the apical membrane of the duct cells [A, antibody K735; B, K741; C, EG(1)-PKIIB; D, EG(1)-CFTR122; E, EG(1)-CFTR843; F, EG(1)-AE2]. Original magnifications, ×360.
