The Ready-to-Assay β1 Adrenergic Receptor Frozen Cells are a simple, thaw-and-assay cell format for use in studying drug candidates (small molecules or biologics) targeting GPCRs. This assay assesses ligand (e.g. epinephrine and norepinephrine) based activation of ADRB1 GPCR activity via detection of increasing levels of intracellular calcium. The included cell line overexpresses ADRB1 alongside endogenous high levels of a promiscuous G-protein, coupling the receptor to the calcium signaling pathway. Upon activation of ADRB1, the resulting calcium activity can be fluorescently assayed. Ready-to-assay kits consist of two vials of the stably modified clonal cell line in a convenient thaw-and-use format. For detailed product information, User manual and datasheet, visit www.discoverx.com/products-applications/frozen-cells.