Fig. 3.

Processes during early development of selected mammalian and non-mammalian species according to the cell cycle. The figure shows important events occurring during the early development of Xenopus, Drosophila, mouse, bovine and human embryos compared to each other during the cell cycle progression, focused specially on maternal protein level changes. Although some processes occur very quickly after fertilization in Drosophila and Xenopus, these embryos are in higher developmental stages than embryos of mammals, where the similar processes occur in earlier developmental stages actually. Green shading density illustrate the maternal to zygotic transition of developmental control. The white arrow marks minor EGA (mouse, bovine, human) or minor MBT (Xenopus, Drosophila). The green arrow marks major EGA (mouse, bovine, human) or major MBT (Xenopus, Drosophila). hpf hours post fertilization, hped hours post egg deposition, EGA embryonic genome activation, MBT mid-blastula transition