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Why seemingly all the neuronal membrane-bound receptor are exclusively GPCR or highly homologous to GPCR family?

I think you're confused about proteins that are GPCRs versus having homology. GABA-B is another that is a GPCR (it is not particularly related to GABA-A). These are also called metabotropic receptors. ...
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Is there a mechanical/vibrational communication method between pre- and post-synaptic terminals in addition to chemical and electrical synapses?

Short answer Action potentials travelling through the axon are accompanied by a mechanical displacement of the axonal membrane. Background Multiple studies have shown that a mechanical displacement of ...
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