UASt regulatory sequences drive expression of a transcript that encodes two open reading frames separated by a T2A linker (this results in separate translation of each protein). The first ORF encodes a phosphomimetic variant (EE) of the Clover-based 'ERK-KTR' kinase translocation reporter of MAPK activity. The phosphomimetic mutations result in the ERK-KTR[EE] protein being constitutively located in the cytoplasm, regardless of endogenous MAPK activity levels. The second ORF encodes His2Av tagged with mCherry.