Single neural rosettes (IMAGE) University of Utah Health Caption Simone Chiola, PhD, picks radial structures called neural rosettes that have formed from human stem cells. Over months, the structures from become spheroid organoids that model aspects of the human brain. Credit Nika Romero Usage Restrictions Use with credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.