First cleavage of a live mouse zygote. Clear circles are the nuclei which are in a sea of granule dense yolk. The band around the two cells is the zona pellucida.

First cleavage of a live mouse zygote. Clear circles are the nuclei which are in a sea of granule dense yolk. The band around the two cells is the zona pellucida.

This confocal image shows a 13.5 days post coitum female mouse gonad at high magnification (x40). The developing ovary and mesonephros were fluoresently stained with an endothelial and germ cell marke...

Confocal micrograph showing the development of motor neurons in the mouse forelimb at 11.5 days post coitum. The transgenic mice expresses a transgene of the Hb9 gene containing a genetic insert of th...