INTRODUCTIONThe major salivary glands in human comprise the parotid, sublingual, and submandibular glands. The parotid gland is serous in both human and rodents (Roa & Del Sol, 2019). In rodents, the parotid gland is located behind and below the ear, caudally bordering the submandibular gland (Amano et al., 2012). Parotid gland consists of the parenchyma (glandular secretory tissue) and the stroma (the supporting connective tissue). The parenchyma comprises of secretory acini, intercalated ducts, striated ducts and collecting ducts, that join to form the main duct (Harrison, 2021).