TRANSCRIPTION FACTORS. “The genetic switch between immature and adult forms in both types of insects relies on the disappearance of the antimetamorphic juvenile hormone (JH) and the transcription factors Krüppel-homolog 1 (Kr-h1) and Broad-Complex (BR-C) during the last juvenile instar.”
http://www.pnas.org/content/111/19/7024.full