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The fly eye is a stochastic mosaic of two ommatidial subtypes. (a) Rhodopsin (Rh)3 and Rh4 are stochastically distributed in R7 neurons. Rh5 and Rh6 are stochastically and exclusively distributed in R8 neurons, and their expression is coupled to R7 subtype specification. (b) The yellow subtype is determined by the stochastic expression of the Spineless (Ss) transcription factor in R7s. Pale subtype fate is signaled from R7 to R8. Wts, Warts; Melt, Melted.
