There is a theoretical protein called largeX that helps to stimulate growth of the body

during adolescence. The promoter on the IrgX gene that codes for it normally can

have a protein bind to it that promotes transcription called largene. Largene, bound

to the promoter, can receive yet another signal in the form of largeXase-a protein

that changes the conformation of largene so that it can no longer bind to the

promoter. What kind of protein is largene?