Animation of human sperm cells approaching an egg, preparing to fertilise it. Only one sperm cell may penetrate the egg's outer layer to complete fertilisation, after which the egg becomes impermeable to other sperm. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / SciePro |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Länge: | 16 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |