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Ready to master apoptosis detection? This comprehensive guide delivers a detailed, step-by-step TUNEL assay protocol, the gold standard for visualizing DNA fragmentation. We've synthesized expert advice from top scientific sources to cover the core principle, a complete protocol for cells and tissues, and the critical troubleshooting tips you need to avoid false positives. Learn how to get reliable, publication-ready data by optimizing fixation, permeabilization, and controls