Sperm has been grown in a test tube for the first time

[ukhudshanskiy]

The development raises hopes that young boys undergoing chemotherapy for testicular cancer will still be able to father their own children when they grow up.

The sperm was produced in a test-tube from the cells taken from a newborn mouse testicles and then injected into eggs to produce to twelve healthy babies, four male and eight female, which were all fertile and able to reproduce themselves in adulthood.

Dr Takehiko Ogawa, an urologist at Yokohama City University in Japan, said the production of sperm in the testes is one of the most complex processes in the body.

It has never been reproduced in a test tube in mammals before.