S1 Supporting Information Selenium Incorporated Cationic Organochalcogen: Live Cell Compatible and Highly Photostable Molecular Stain for Imaging and Localization of Intracellular DNA Pankaj Gaur, a,ǁ Ajay Kumar, b,ǁ Gourab Dey, a Rajendra Kumar, c Shalmoli Bhattacharyya, b, * Subrata Ghosh a, * a School of Basic Sciences, Indian Institute of Technology Mandi, Mandi-175001, H.P, India. b Department of Biophysics, Post Graduate Institute of Medical Education and Research, Chandigarh-160012 c UGC Centre of Excellence in Applications of Nanomaterials, Nanoparticles &Nanocomposites Panjab University, Chandigarh-160014