Mouse sperm are unable to bind the zebrafish chorion, yet a subset of hyperactivated sperm can enter and cross the micropyle, suggesting a conserved mechanism of gamete interaction across species.
Introducing premature visual experience by opening the closed eyelids early in ferrets caused many cells in the primary visual cortex to mature improperly.
The first follicle wave undergoes atresia to amplify androgen-producing theca cells, while previously unknown wave 1.5 follicles leave quiescence at 2 weeks and produce most of the earliest offspring.
Differences in the activity of an enzyme called CARM1 influence the timing of blastomere polarization and whether they become part of the embryo or the placenta.
