Confocal Microscopy Image (IMAGE) Université de Genève Caption Confocal microscopy image showing the embryonic preoptic region, sitting on the brain floor. Cortical neurogliaform cells come from this region that borders the third ventricle (middle, in black), marked by the expression of the transcription factor HMX3 (in red). Credit © UNIGE Usage Restrictions None 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.