Human egg cell. Computer illustration of a human ovum (egg cell),showing the zona pellucida (outer layer). After fertilisation the nuclei of the sperm cell and the ovum fuse to form a zygote. The zygote then undergoes repeated mitosis (cell division). Cell division occurs approximately every twenty hours,to form a cluster of cells known as a morula,which continues to divide to form a blastocyst,and subsequently the embryo | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / De Angelis, Maurizio |
Bildgröße: | 4200 px × 4200 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |