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A representative of Nf-1 GISTs of (a) 67 year old male, (b) 36 year old female, (c) 25 year old male, and (d) 60 year old male. A majority of Nf-1 associated GISTs exhibited positive, granular, cytoplasm staining for SDHB in gastrointestinal stromal tumors. All positively stained cells show granular cytoplasm (mitochondrial) staining pattern.
