THE UNIVERSAL ADULT SPECIFIER. “Here, we report that a single factor, E93, controls juvenile-to-adult transition in hemimetabolous and holometabolous insects, thus acting as the universal adult specifier in winged insects. Interestingly, we find that E93 not only promotes adult metamorphosis but also represses the expression of the antimetamorphic genes Krüppel-homolog 1 and Broad-Complex, ensuring the proper juvenile–adult transition.” (E93= a transcription factor).
http://www.pnas.org/content/111/19/7024.full