Animation of a human sperm cell fertilising an egg. Only one sperm cell may penetrate the egg's outer layer to complete fertilisation, after which the egg becomes impermeable to other sperm. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Leroy, Francis / Biocosmos |
Modell-Rechte: | nicht erforderlich |
Länge: | 20 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |