Overview
- On Wednesday, July 1, 2026, California startup Conception announced it had generated primary human oocytes by reprogramming a blood sample into induced pluripotent stem cells and growing miniature ovarian tissue in the lab.
- The cells reported are early-stage primary oocytes that are immature and not fertilizable, and the results have not been published or independently validated.
- Conception’s process begins with a simple blood draw, converts blood cells into iPSCs, and then guides those iPSCs to form lab-grown ovarian tissue where egg precursors develop inside follicle-like structures.
- CEO Matt Krisiloff posted the company update on X calling the result significant while the company cautioned clinical use is years away and will require rigorous safety testing.
- The work builds on 2016 mouse studies that produced fertile offspring from stem-cell-derived eggs, but experts say human IVG faces major biological, safety, ethical, and regulatory hurdles before any real-world use.