The term “receptors” is usually reserved for those recognition sites on the surface of a cell that result in responses such as secretion, contraction or relaxation when the sites are occupied by agonists. For the purposes of this overview, however, it is appropriate to include two other categories of recognition sites — namely, ectoenzymes and sites for active transport. There are examples of all three classes of these recognition sites for purines on the surface of vascular endothelial cells.
KeywordsAdenine Nucleotide Induce Platelet Aggregation Uptake Site Prostacyclin Production Microcarrier Bead
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