Figure 7

Zygote scoring system of Wittemer et al. [11]. They defined zygotes with “normal” pattern 0 as zygotes with the four following characteristics: (i) the number of NPBs never differed by more than 3 (A); (ii) NBPs always polarized when fewer than 7 and never polarized if more than 7 in at least one PN (B and C); (iii) the number of NBPs in PN never fewer than 3 (D); (iv) the distribution of NPBs either polarized or not in both PN (E and F). Whereas zygotes that did not conform to this morphological pattern were considered as “abnormal”.