Tapeins
Tapeins are a family of G protein-coupled receptors (GPCRs) that play a crucial role in the nervous system. These receptors are characterized by a conserved motif in their third intracellular loop, which is thought to be involved in their interaction with specific signaling partners. Tapeins are found in a wide range of organisms, from invertebrates to vertebrates, suggesting an ancient evolutionary origin.
In mammals, tapeins are primarily expressed in neurons, where they are involved in regulating neuronal excitability