The technology for growing miniature human organs from stem cells began to actively develop only in the last decade. However, scientists have already been able to get analogues of the heart, kidneys, brain, stomach, lungs, retina, large and small intestines in laboratory conditions. They have groups of differentiated cells, similar to what are in full -sized organs. To get an organoid, stem cells are placed on an environment that allows them to form a three -dimensional structure.