Fig. 1

Definition of parameters annotated during fertilisation. The initial positions of the pronuclei were categorised into three groups: central (yellow), intermediate (green), and cortical (grey). The position of the pronucleus in relation to that of the cytoplasmic halo was also annotated (same side vs. opposite side). Dark grey, cytoplasmic granules; light grey, halo; blue, male pronucleus; purple, female pronucleus