For species that rely on sexual reproduction, including mice and men, offspring can only happen if sperm from the male fertilize eggs from the female. Even artificial fertilization techniques depend ...

In the present work, we show that the Fgf9 antimeiotic effect is mediated by activation of the Cripto-Nodal-Smad2/3 signaling in postnatal spermatogonia, and that this activation requires ...

Spermatogenesis in mammals is crucial for male fertility. It starts after birth and continues throughout life, relying on spermatogonial stem cells (SSCs). SSCs can differentiate into early ...

July 10, 2026 expert reaction to study attempting to generate spermatogonia from human and macaque pluripotent stem cells in the lab . A study published in Cell Stem Cell looks at ...

Is this the first lab-grown human sperm? A French team claiming the achievement has moved a stage closer to convincing sceptics by having the work published in a peer-reviewed journal. But some ...

Human testes are masters of mass production, spitting out sperm at a rate of 200 million per day. But that doesn’t mean the process is fast–it takes 64 days to make a sperm. The organ keeps the count ...