By trial and error, Ogawa's team worked out which culture methods allowed sperm in tissue fragments from neonatal mouse testes to mature. (scientificamerican.com)
You may pass tissue fragments and a recognizable gestational sac or embryo. (verywellfamily.com)
Kuo's method starts with tissue fragments rather than individual stem cells and grows them in a gel partly exposed to air instead of submerged in nutrient medium. (sciencemag.org)