“Researchers created the synthetic ovaries by printing porous scaffolds from a gelatin ink and filling them with follicles, the tiny, fluid-holding sacs that contain immature egg cells.” The researchers also “found that the implants hooked up to the blood supply within a week and went on to release eggs naturally through the pores built into the gelatin structures.”
https://www.theguardian.com/science/2017/may/16/3d-printed-ovaries-allow-infertile-mice-to-give-birth
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