Neural rosettes (IMAGE) Johns Hopkins Medicine Caption Left, human neural stem cells form rosettes as they grow into different cell types, with ringlike patterns of PKCλ protein in the center. A neural rosette with a 15q11.2 microdeletion, a risk factor for schizophrenia, appears disorganized and lacks the ringlike PKCλ protein structure, right, suggesting that this risk factor acts early in the neurodevelopmental process. Credit Ki-Jun Yoon/Johns Hopkins Medicine Usage Restrictions Credit required. License Licensed 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.