Salivary gland histopathology. Focal mononuclear cell infiltration of the salivary gland characteristic for Sjögren's syndrome. (a) Hematoxylin and eosin stained section of a submandibular gland, a sublingual gland and parts of the parotid salivary gland with a lymph node. (b) Magnification of a focal mononuclear cell infiltrate. The specimen was obtained from a 21-week-old nonobese diabetic mouse. Figure adapted from .