science 🔬 Ovaries aren't passive; they actively monitor egg supply
Scientists created the first 3D map of how a mammalian ovary changes throughout its lifespan. Researchers at the Center for Genomic Regulation in Barcelona tracked over 85,000 egg cells in more than 100 intact mouse ovaries. The study found that 14% of eggs are activated regardless of the mouse's age, challenging old assumptions. This suggests the ovary actively counts eggs, possibly via an unknown signal. Future research could use this to delay menopause and extend reproductive health. 🥚