Hopefully, you have found ducts which identify this as an exocrine
gland. If you hadn't recognized the large ducts in the interlobular
connective tissue (arrows), look again now. (Make sure you distinguish
ducts from blood vessels; the ducts are the ones with the cuboidal-to-columnar
epithelium, two-layered in the larger examples.)
Hopefully, you have also recognized both serous acini and mucous tubules,
identifying this as a mixed gland. If not, please examine
the specimen again after reviewing the distinction between serous
and mucous secretion. If you've gotten this far, don't worry
about which particular mixed gland (as long as you can tell that
is NEITHER parotid gland NOR pancreas).
Make sure you can distinguish between the secretory parenchyma (serous
and mucous cells) and the numerous small intralobular ducts. (In
small ducts, the nuclei are centrally located and the cytoplasm is not
conspicuously polarized.)
Also notice the scattered patches of inflammatory infiltrate
(regions of glandular stroma packed with small round nuclei of lymphocytes).
Note the number of adipocytes scattered throughout the stroma. (Trivia:
Fat cells are common in intralobular stroma of salivary glands
but rare in normal pancreas.)
No more hints.
