Electron Microscopy / Stem Cells / Virology / Cell Culture / Biological Sciences / Humans / Cell Death / DNA hybridization / Astrocyte / Glial Cell / Central Nervous System / Astrocytes / Model development / mRna expression levels / X ray diffraction / Necrosis / Capsid Protein / JC Virus / Humans / Cell Death / DNA hybridization / Astrocyte / Glial Cell / Central Nervous System / Astrocytes / Model development / mRna expression levels / X ray diffraction / Necrosis / Capsid Protein / JC Virus