In the developing Drosophila eye, differentiation is coordinated with
synchronized progression through the cell cycle. Signaling mediated by
the transforming growth factor-beta-related gene decapentaplegic (dpp
) was required for the synchronization of the cell cycle but not for c
ell fate specification. DPP may affect cell cycle synchronization by p
romoting cell cycle progression through the G(2)-M phases. This synchr
onization is critical for the precise assembly of the eye.