Luminal membranes of foregut epithelia of Aplysia californica contain a sodiumsulfate symporter. Cyclic guanosine monophosphate stimulated the absorptive activity of the sodiumsulfate symporter, whereas cyclic adenosine monophosphate had no effect on the sodiumsulfate symporter. It appears that guanylate cyclase plays a role in the overall regulation of sulfate homeostasis by the A. californica gut.
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Gerencser et al. (2001) studied this question.
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