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=== Class A GCPRs ===
=== Class A GCPRs ===


Class A GPCRS or [https://en.wikipedia.org/wiki/Rhodopsin-like_receptors rhodopsin-like GPCRS] are the largest and most studied type of GPCRS. These receptors are commonly found in [https://en.wikipedia.org/wiki/Mast_cell mast cells], an immune cell used in the inflammatory response. When these mast cells are activated, they will release [https://en.wikipedia.org/wiki/Granule granules] containing [https://en.wikipedia.org/wiki/Histamine histamine] and other inflammatory [https://en.wikipedia.org/wiki/Cytokine cytokines]. These mast cells are found in abundance in the digestive tract, trachea, and skin <ref name="Ramesh">Ramesh, Soliman, et al. (2015) "G-Protein Coupled Receptors (GPCRs): A Comprehensive Computational Perspective." Combinational Chemistry and High Throughout Screening, 18(4), 346-364, https://pubmed.ncbi.nlm.nih.gov/25747435/</ref>. They are characterized by conserved motifs including DRY, PIF, Sodium Binding, and the CWxP <ref name="Zhou">PMID: 31855179</ref>. A common example of a class A GPCRS is the [https://proteopedia.org/wiki/index.php/Beta-2_Adrenergic_Receptor#:~:text=Beta%2D2%20Adrenergic%20Receptors%20(B2ARs,with%20over%201000%20unique%20Isoforms. β2AR receptor], which is involved in the activation of the "fight or flight" system by the sympathetic nervous system<ref name="Cao">Cao, Can, et al. "Structure, function and pharmacology of human itch GPCRs." Nature, Nature Publishing Group, 17 November 2021, https://www.nature.com/articles/s41586-021-04126-6</ref>.
Class A GPCRS or [https://en.wikipedia.org/wiki/Rhodopsin-like_receptors rhodopsin-like GPCRS] are the largest and most studied type of GPCRS. These receptors are commonly found in [https://en.wikipedia.org/wiki/Mast_cell mast cells], an immune cell used in the inflammatory response. When these mast cells are activated, they will release [https://en.wikipedia.org/wiki/Granule granules] containing [https://en.wikipedia.org/wiki/Histamine histamine] and other inflammatory [https://en.wikipedia.org/wiki/Cytokine cytokines]. These mast cells are found in abundance in the digestive tract, trachea, and skin <ref name="Ramesh">Ramesh, Soliman, et al. (2015) "G-Protein Coupled Receptors (GPCRs): A Comprehensive Computational Perspective." Combinational Chemistry and High Throughout Screening, 18(4), 346-364, https://pubmed.ncbi.nlm.nih.gov/25747435/</ref>. Class A GPCRs are characterized by conserved motifs including DRY, PIF, Sodium Binding, and the CWxP <ref name="Zhou">PMID: 31855179</ref>. A common example of a class A GPCRS is the [https://proteopedia.org/wiki/index.php/Beta-2_Adrenergic_Receptor#:~:text=Beta%2D2%20Adrenergic%20Receptors%20(B2ARs,with%20over%201000%20unique%20Isoforms. β2AR receptor], which is involved in the activation of the "fight or flight" system by the sympathetic nervous system<ref name="Cao">Cao, Can, et al. "Structure, function and pharmacology of human itch GPCRs." Nature, Nature Publishing Group, 17 November 2021, https://www.nature.com/articles/s41586-021-04126-6</ref>.