الفهرس 
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Abstract
The aim of the present study is to investigate the effect of monosodium glutamate, weighing the risks and benefits of its use on the structure of the rat’s circumvallate papillae and von Ebner’s salivary gland complex using:
1- Hematoxylin and eosin staining to detect any histological changes.
2- Immunohistochemical localization of S-100 protein in innervation of the same tissue under investigation.