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Fig. 9. Schematic representation of transporters that we discuss in conjunction
with steady-state pHi regulation (A) and the 5-HT- and cAMP-induced
acidification (B). Note: 5-HT causes an acidification, a cAMP-mediated
increase in the number of H+-pumping V-ATPase holoenzymes in the
apical membrane of the gland cells and stimulates cellular respiration (B).
For details, see Discussion.