Acyclic retinoid induces differentiation and apoptosis of murine hepatic stem cells March 26, 2015 Stem Cell Research Therapy 2015, 6:51Â doi:10.1186/s13287-015-0046-9 Hong-Bin Guan, Yun-Zhong Nie and Yun-Wen Zheng contributed equally to this work. Published: 26 March 2015