By Rachel Hagan ‘Mini organs’ have been grown from human stem cells taken during pregnancy in a breakthrough that could help spot health problems before birth. Miniorgans, or “organoids”, are tiny simplified structures that can be used to test new medical treatments or study how the real organs they mimic work, whether they are healthy or diseased. Researchers from University College London (UCL) and Great Ormond Street Hospital collected cells from amniotic fluid samples taken during 12 pregnancies as part of routine prenatal testing. They showed that fluid flowing around the baby in the womb…