TRPV1

The transient receptor potential cation channel subfamily V member 1 (TRPV1), also known as the capsaicin receptor and the vanilloid receptor 1, is a protein that, in humans, is encoded by the TRPV1 gene. It was the first isolated member of the transient receptor potential vanilloid receptor proteins that in turn are a sub-family of the transient receptor potential protein group. This protein is a member of the TRPV group of transient receptor potential family of ion channels.

Fatty acid metabolites with affinity for this receptor are produced by cyanobacteria, which diverged from eukaryotes at least 2 billion years ago.
The function of TRPV1 is detection and regulation of body temperature.
In addition, TRPV1 provides a sensation of scalding heat and pain (nociception).

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Source: Wikipedia · Image: Wikimedia Commons · Public domain