Table 1. Cellular localization of aquaporin-1 in the human and mouse trigeminal nervous system.

Regions	Neural elements	Humans	Mice
Trigeminal ganglion	Medium and small-sized neurons	+	+
	Large-sized neurons	−	−
	Satellite cells	+	+
Trigeminal peripheral root	Nerve fibers	+	+
Trigeminal central root	Astrocytes	+	−
	Nerve fibers	−	+
Brain stem	Astrocytes	+	−
	Nerve fibers within spinal trigeminal tract and nucleus	−	+
Oral tissues	Mucosal and submucosal nerve fibers	+	+
	Subcutaneous and intramuscular nerve fibers	−	−

+ represents AQP1 immunoreactivity is detectable and − represents is not.