The involvement of heparan sulfate proteoglycans in stem cell differentiation and in malignant glioma Soumi Kundu, Anqi Xiong and Karin Forsberg-Nilsson Eur. Phys. J. Plus, 131 4 (2016) 85 Published online: 08 April 2016 DOI: 10.1140/epjp/i2016-16085-7