A sperm cell (right) swims towards a human egg (artificially coloured). Credit: AJ Photo/Science Photo Library The day when human sperm and eggs can be grown in the laboratory has inched a step ...

Human sperm have long been a subject of fascination—not just for their role in fertilization, but for their remarkable ability to navigate through some of the most viscous environments in the ...

In an advance for treating male infertility, researchers transplanted a patient with his own sperm-forming stem cells that were collected from testicular tissue when he was a child.

Scientists have been able to produce sperm-like cells using mouse stem cells, said Easley, but rodent sperm production is distinctly different than humans.

Cells with the potential to form sperm and eggs have been derived from northern white rhino skin cells, raising hopes that lab-grown embryos could save the animals from extinction. The only two ...