ION Biosciences' Brilliant Thallium Snapshot Assay Flex kit is an endpoint-compatible potassium channel assay. Brilliant Thallium Snapshot kit is a thallium flux assay adaptation designed to work with standard plate readers, microscopes, flow cytometers, and more, for measuring flux through potassium (K⁺), sodium (Na⁺), and non-selective cation channels, transporters, and their effectors, including GPCRs. 10 plate kit.