RHO and neoplasm: In the adult retina, a bistable feedback loop of the growth regulator melted and the tumor suppressor warts acts to specify Rh5 versus Rh6 cell fate, respectively [11], while in the larva, Sens, Sal, Svp and Otd control Rh5 versus Rh6 identity [7] whereas Hazy has been shown to maintain Rhodopsin expression.