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

Created from stem cells, without eggs, sperm, or a womb ... the model wasn’t perfect—more like a rough sketch. It had no chance of developing into an actual baby. But in 2022, when two ...

Two new landmark studies show how a seeming tangle of DNA is actually organized into a structure that coordinates thousands of genes to form a sperm cell. The work, published March 3 as two papers ...