“Measuring the functional behavior of G protein-coupled receptors (GPCRs) has been a major focus of academic and pharmaceutical research for many decades. These efforts have led to the development of many assays to measure the downstream effects of ligand binding on receptor activity. In this chapter, we describe an internalization/recycling assay that can be used to track changes in receptor number at the plasma membrane. Used in concert with other assays, this antibody-based technique can provide important information on GPCR activation by receptor-specific ligands.”
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