Tau immunoreactivity within submandibular glands. Diagnostic group and antibody used are listed in the lower left corner of each photo. Thread-like immunoreactivity is indicated by black arrows, stromal nerve fascicles by #, and ganglion cells as *. (j) inset of boxed region in i. (a-f, h-i) scale bar= 50um; (e, i) scale bar=200um, (j,l) scale bar=50um.