A 247 bp sequence of Mef2 encoding the MB247 enhancer and the hsp70 core promoter regulate expression of a GAL4(DBD)::Zip- hemidriver (component of the 'Split GAL4' system, contains the GAL4 DNA-binding domain).
p65(AD)::Zip+ is under the control of 12 cAMP response element (CRE, TGACGTCA) repeats. A yeast-derived degron (CL1) is attached, to accelerate protein turnover and avoid toxicity.