area postrema (IMAGE) Cold Spring Harbor Laboratory Caption Neurons (blue) in a part of the brain called the area postrema, seen here, express a variety of genes, including receptors for the immune system molecule IL-6 (white). Credit Li lab/Cold Spring Harbor Laboratory Usage Restrictions Attribution required 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.