In mid instar larvae salivary glands levels increase during 86-94 hours of development and represent the predominant isoform during puff stage 1. Levels remain relatively constant in late larvae until the premetamorphic pulse of ecdysone. Transcripts are detected again from puff stages 12-14 and 17-21. The expression of this protein is developmentally regulated and is correlated with the 20-OH-ecdysone induced activity of puff 74EF. Belongs to the ETS family.