Kinases: they regulate many proteins, with ~1/3 of human proteins predicted to be phosphorylated on at least one site. Phosphorylation is particularly important for regulating signal transduction and measuring kinase activity at the single-cell level can aid in drawing connections between signaling activity and cell phenotype. One method for monitoring live single-cell kinase activity is FRET, but FRET reporters are challenging to design and difficult to multiplex. The Covert Lab provides an alternative tool with their Kinase Translocation Reporters (KTRs) whose cellular localization serves as a proxy measurement of kinase activity. The key advantage of KTRs is that they are easy to create and simple to multiplex.