In an advance for treating male infertility, researchers transplanted a patient with his own sperm-forming stem cells that ...

It's commonly thought that sperm "race" to the egg, with the winner fertilizing it. But is this really the case?

Scientists have found a way to study early embryonic development without real embryos. Using CRISPR, they programmed stem cells to self-organize into structures mimicking early embryos. The cells show ...

"[The] majority of the sperm shown in the video won't make it to the egg but in IVF, we can assist by injecting the sperm directly into the egg ... when sperm cells stick together—"is not ...

Warning: It gets weird. Before we jump into how wrong many of history's great thinkers were, here's what we know now. A sperm cell and an egg cell each contain half the DNA to make a person.

"These cells co-develop together, just like they would in an actual embryo, and establish that history of being neighbors," ...

A key part of the fertility process involves IZUMO1, a protein on the surface of sperm cells, and JUNO ... the way sperm come into contact with an egg. The analysis also identified a high-affinity ...

The fluids provide the sperm cells with nutrients ... The cilia waft the egg along inside the oviduct and into the uterus. The uterus, also called the womb, is a muscular bag with a soft lining.

A key part of the fertility process involves IZUMO1, a protein on the surface of sperm cells, and JUNO ... the way sperm come into contact with an egg. The analysis also identified a high-affinity ...

"Abnormal sperm formation impairs their ability to fertilize egg cells," explains Yuki Kaneda ... the findings from this study provide important insight into the causes of male infertility.