Science image (IMAGE) Salk Institute Caption Left: An immune brain cell (microglia) in a human brain. Right: Microglia in the novel organoid model with a human-brain-like environment. The cells are almost indistinguishable. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.