An electron microscopic study of acetylcholinesterase-activity and vasoactive intestinal peptide- and neuro-peptide y-immunoreactivity of the intraepithelial nerve fibers in the nasal gland of the guinea pig. - Yokoyama,R.; Inokuchi,T.; Takahashi,Y.; Watanabe,I. (Arch Histol Cytol, 1991)