Supplementary_Figure_1_Characterization_of_U87MG for The Development and Applications of a Dual Optical Imaging System for Studying Glioma Stem Cells by Po-An Tai, Yen-Lin Liu, Ya-Ting Wen, Chien-Min Lin, Thanh-Tuan Huynh, Michael Hsiao, Alexander T. H. Wu and Li Wei in Molecular Imaging