Major breakthrough in reproductive medicine! Conception successfully transforms “blood” into early human oocytes, creating 3D mini ovaries

Reproductive medicine has achieved a historic sci-fi-level breakthrough! This month, the U.S. reproductive technology company Conception released its latest scientific results, announcing that it has successfully cultivated the world’s first batch of “early human eggs” in the lab using human blood stem cells. This technology not only created 3D “mini human ovaries” in the lab, but also successfully observed cells entering meiosis and forming early follicles. In the future, it may enable women to obtain unlimited healthy eggs through a simple blood draw, completely rewriting the rules of human reproduction.
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Table of Contents

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• Say goodbye to egg retrieval surgery? The disruptive potential of IVG technology
• No shortcuts: Rebuilding “mini ovaries” in the lab
• Conception’s three major scientific milestones
• Next step: Advancing toward clinically usable mature eggs

Human reproduction is at a crossroads of revolutionary change. Conception, a reproductive technology company focused on turning stem cells into human eggs, released in June 2026 a scientific update report that shocked the biomedical community: they have successfully generated the world’s first batch of early human eggs (Primary Oocytes) from human stem cells.

Say goodbye to egg retrieval surgery? The disruptive potential of IVG technology

This technology, known as In Vitro Gametogenesis (IVG), has a ultimate goal: to help infertile patients or older women overcome biological and genetic limitations. As early as 2016, Conception’s partner Katsuhiko Hayashi had already achieved this in mice (converting mouse skin cells into eggs capable of reproduction, and producing healthy offspring). However, to replicate it in humans, the challenge rises exponentially.

Once human IVG technology matures, future in vitro fertilization (IVF) treatments are set to undergo transformative changes:

• Eliminating bodily suffering: Women would no longer need to endure painful hormonal ovulation injections and invasive egg retrieval surgery. They would only need a simple draw of a small amount of blood.
• Breaking age barriers: Even when women are older and ovarian function declines, it can still produce young, healthy eggs for them.
• No limits on egg numbers: In the lab, it would be possible to produce a large quantity of healthy eggs needed by a family at once, expanding options for reproduction and genetic screening.

No shortcuts: Rebuilding “mini ovaries” in the lab

In its report, Conception emphasized that cultivating healthy human eggs comes with no shortcuts. They are not simply making single egg cells in a petri dish; instead, they recreate the natural process of egg development as closely as possible. Using 3D culture technology, the team successfully built “mini human ovaries (Mini-ovaries)” containing millions of potential egg cells.

The entire transformation process is as follows:

2. Blood sampling and conversion: Draw blood from the human body and convert its blood cells into induced pluripotent stem cells (iPSCs).
3. Bidirectional differentiation induction: Guide these stem cells to differentiate into future eggs—primordial germ cells—and ovarian helper cells, which provide developmental signals.
4. 3D structural assembly: Combine these two cell types so they naturally form 3D mini-ovary cell spheres.

Conception’s three major scientific milestones

| Scientific breakthrough | | --- | | Technical details and medical significance | | --- | | ① Recreating “nest-like structures” (Nests formation) | Mini-ovaries successfully formed nest-like structures highly similar to real human ovaries. Primordial germ cells were surrounded by helper cells, and the process was formed entirely independently from stem cells, without relying on any natural human ovarian cells. | | ② Successful initiation of meiosis (Meiosis initiation) | Meiosis is the most critical and highly precise process through which eggs halve their chromosomes. The team not only observed the assembly of chromosome-pairing structures, but also confirmed that early egg genes (such as those forming the protective layer zona pellucida) had been activated. | | ③ Fully iPSC-derived follicles (Fully iPSC-derived follicles) | This is a world first! The team successfully generated early follicles entirely from iPSCs. Under a microscope, each follicle contains an early egg and is tightly surrounded by a single layer of helper cells—an important step toward egg maturation. |

Next step: Advancing toward clinically usable mature eggs

Although Conception accomplished the feat of “generating early human eggs,” the company admits that there is still a way to go before the technology can truly be used in clinical reproduction. The current early eggs cannot yet be used directly for fertilization. The team’s next goal is to continue culturing these follicles from the primordial stage to the mature antral stage (the stage in current IVF treatments at which eggs can be retrieved).

To achieve this goal, Conception says it has already begun successful testing on donated human ovarian tissue. In the future, the company will conduct more in-depth animal model testing to strictly verify the safety and quality of these lab-grown eggs. Along with this breakthrough, Conception is also actively expanding its team—opening multiple positions in stem cell biology and genetic engineering in Berkeley, California—so it can drive full speed ahead on the ultimate revolution in human reproductive technology.