Keywords: تشخیص شیمیایی; AB; Alcian blue; MIG; multicellular intraepithelial gland; OG; olfactory gland; PAS; periodic acid-Schiff; VNG; submucosal vomeronasal gland; VNO; vomeronasal organ; Chemical detection; Glycan; Sugar chain; Secretory system; Ursus arctos;