Fergus Walsh, BBC News Medical Correspondent, shows us round the lab where human sperm has been created using stem cell research.
The sperm may lead to future treatments for people who are infertile. But researchers say it will not be used to create human babies - and will not mean the end of men.
The new technique to grow sperm from embryonic stem cells was developed by Newcastle University and the NorthEast England Stem Cell Institute (NESCI).
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