AQP distribution in the human body. Expression of AQP paralogs in the (a) brain, (b) blood–brain barrier, (c) eye, (d) exocrine glands, (e) inner ear, (f) cardiovascular system, (g) spine, (h) heart, (i) respiratory tract (trachea and lung; inset showing alveoli), (j) skeletal muscle, (k) pancreas, (l) liver, (m) gastrointestinal tract, (n) kidney, (o) skin (inset showing adipose tissue), and (p) female as well as (q) male reproductive tracts. This summary is not comprehensive; minor AQP subtypes are omitted for clarity. Bold text is used to highlight the major AQPs studied in the selected tissues. Created with BioRender.com; adapted from Day et al., 2014 [12].