Fig. 1 (IMAGE) Osaka University Caption CAR cells are specialized mesenchymal stem cells, which express the specific transcription factors, Ebf1/3, inhibiting osteoblast differentiation to remain undifferentiated, maintain marrow cavities, enhance CXCL12 and SCF expression, and create HSC niches. Credit <em>Genes & Development</em> 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.