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 non-phosphorylatable variant (AA) of the Clover-based 'ERK-KTR' kinase translocation reporter of MAPK activity. The non-phosphorylatable mutations result in the ERK-KTR[AA] protein being enriched in the nucleus, regardless of endogenous MAPK activity levels. The second ORF encodes His2Av tagged with mCherry.