Up to now, four subtypes of human histamine receptors (HR)s have been identified: H1R, H2R, H3R, and H4R, all of them being GPCRs with seven transmembrane (TM)-spanning helices, which are expressed on various cell types.
CITATION STYLE
Ennis, M., Ciz, M., Dib, K., Friedman, S., Gangwar, R. S., Gibbs, B. F., … Vasicek, O. (2013). Histamine receptors and inflammatory cells. In Walter de Gruyter 4 (Vol. 9788376560564, pp. 103–143). Versita. https://doi.org/10.2478/9788376560564.c4
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