Texas Membrane proteins, receptors: cell surface receptorsG protein–coupled receptorClass A Eicosanoid receptor (Prostaglandin receptor) Protease-activated receptor Neurotransmitter receptor Purinergic receptor Biogenic amine receptor Olfactory receptor Class B Secretin receptor Class C Metabotropic glutamate receptor Class D Pheromone receptor Class E cAMP receptor Class F Frizzled/smoothened Ligand-gated ion channel Purinergic receptor Enzyme-linked receptor Serine/threonine-specific protein kinase Receptor tyrosine kinase Guanylate cyclase Other/ungrouped Asialoglycoprotein receptor Tumor necrosis factor receptor Immunoglobulin superfamily N-Acetylglucosamine receptor Neuropilins Transferrin receptor EDAR Lipoprotein receptor-related protein Progestin and adipoQ receptor