On April 29, GPCR scientists filled Pressed Cafe in Boston for the first Dr. GPCR Happy Hour of 2026. No slides, no panels, just the conversations that usually happen in hallways or never at all. Here is what the night looked like, and why it is exactly why this community exists.

Calcium mobilization is one of the fastest and most sensitive ways to measure GPCR activation, but no single readout fits every question. This article walks through how calcium assays work, compares dye-based, aequorin, and genetically encoded detection approaches, and shows how to match the right cell model and assay format to your drug discovery goals.