Figure 5

Zygote scoring system of Scott et al. [10]. Z1 includes zygotes with equal number of nucleoli aligned at PN junction (A), Z2 includes zygotes with equal number and size of nucleoli (between 3 and 7) which are equally scattered in the two PN (B), Z3 includes zygotes with either very small/large nucleoli (C and D), and Z4 includes zygotes showing PN separated or different in size and small nucleoli, partially aligned or scattered (E and F).