Scientists in Newcastle claim to have created human sperm

By Fergus Walsh
BBC medical correspondent
Tuesday, 7 July 2009

The researchers believe the work could eventually help men with fertility problems to father a child.

But other experts say they are not convinced that fully developed sperm have been created.

Writing in the journal Stem Cells and Development, the Newcastle team say it will be at least five years before the technique is perfected.

They began with stem cell lines derived from human embryos donated following IVF treatment. the rest