Polarization microscopy Anisotropy FRET biosensor 2 Apoptosis 2 Apoptotic network 2 Article 2 Biosensing Techniques 2 Caspase activity 2 Caspases, Effector 2 Co-monitoring 2 Enzyme Activation 2 Fluorescence Polarization 2 Fluorescence Resonance Energy Transfer 2 HeLa Cells 2 HeLa cell line 2 Humans 2 Imaging 2 Microscopy, Fluorescence 2 Signal Transduction 2 anisotropy 2 anisotropy forster resonant energy transfer based biosensor 2 apoptosis 2 caspase 3 2 caspase 8 2 caspase 9 2 controlled study 2 correlation analysis 2 effector caspase 2 enzyme activation 2 enzyme activity 2 fluorescence anisotropy microscopy 2