The Ready-to-Assay CCR1 Chemokine 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. CCL2, MCP-1) based activation of CCR1 GPCR activity via detection of increasing levels of intracellular calcium. The included cell line overexpresses CCR1 alongside endogenous high levels of a promiscuous G-protein, coupling the receptor to the calcium signaling pathway. Upon activation of CCR1, 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.