A 32-year-old man was referred with gastro-oesophageal reflux disease and commenced on a protonpump inhibitor.
Which of the following is true of the gastric K+/H±ATPase proton pump?
A.It is made up of alpha-, beta- and gamma-subunits
B.It is an acute antigen in pernicious anaemia
C.Omeprazole binds to it irreversibly
D.Is situated in chief cells
E.It also occurs in the liver