Healthy mice born from frozen testicle tissue sperm

Sperm grown from the frozen testicle tissue of newborn mice has been used to produce healthy offspring, according to a new Japanese study.

The sperm was grown in a lab from testicular tissue that had been frozen for more than four months, then deposited directly into immature egg cells to yield mouse babies.

The offspring were healthy and able to reproduce themselves in adulthood.

Researchers said the findings were a promising development for men left infertile by childhood treatment for cancers.