GFP reporter expression of the indicated cyclin E transgenic constructs at embryonic stages 11/12 (A, C, E, G, I, and K) or stages 12/13 (B, D, F, H, J, and L) are shown. Multiple insertions of each deletion construct were examined and no significant differences were observed between insertions of the same constructs. The level of GFP expression is summarized in Fig. 1.