Fig. 1From: Nitric oxide-associated chondrocyte apoptosis in trauma patients after high-energy lower extremity intra-articular fracturesStudy Design. Specimens from both groups were stained for all three assays and analyzed under fluorescence microscopy. Cells with intact nuclei were then determined to be apoptotic based on the TUNEL assay. Apoptotic cells were then sub-classified based on the presence of NOBack to article page