Sour
While sour taste has historically been regarded as the domain of ion channels, receptors for sour taste are now being proposed. HCN1 and HCN4 (HCN channels) were two such proposals; both of these receptors are cyclic nucleotide-gated channels. The two ion channels suggested to contribute to sour taste are ACCN1 and TASK-1.
Read more about this topic: Taste Receptor, Mechanism of Action
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