The development opens up the possibility of infertile men being able to father their own children rather than using donor sperm.
Researchers in Germany and Israel were able to grow mouse sperm from a few cells in a laboratory dish.
In a world first a team headed by Professor Stefan Schlatt, at Muenster University in Germany, were able to grow sperm by using germ cells. These are the cells in testicles that are responsible for sperm production.
Read More: Scientists grow sperm in laboratory dish