ION Biosciences' Thallium-free GIRK Potassium Channel Assay Flex kit is the first fluorescence-based potassium channel solution that directly measures potassium flux, enabling you to move away from thallium-containing products. This product features the potassium-sensitive dye, IPG-1 AM, our lowest affinity potassium indicator to measure changes in intracellular potassium concentration. This kit is optimized for GIRK (Kir3.x) screening, and can be used to identify activators and inhibitors of GIRK channels. Traditional approaches for measuring GIRK activity such as patch clamp, FRET, or thallium flux assays can be labor-intensive, low-throughput, or reliant on toxic surrogate ions. To overcome these limitations, ION Biosciences built the Thallium-Free GIRK Potassium Channel Assay featuring ION Potassium Green-1 AM (IPG-1 AM), a membrane-permeable, potassium-sensitive, fluorescent indicator that directly measures potassium flux. 10 plate kit.