Quality Control: The ScienCell™TUNEL Apoptosis Assay is applied to Human Astrocytes (HAs) treated with and without DNase I, which serve as our positive and negative controls, respectively. Dark nucleuscan only be observed in cells treated with DNase I.The ScienCell™TUNEL Apoptosis Assay is also applied to Rat Cortical Neuronscultured with ScienCell™ Neuronal Medium for 3 days, and apoptotic cells can be identified with dark nucleus.