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Expression of cyclin H in gastrointestinal stromal tumours. Serial sections of gastrointestinal stromal tumours (GISTs) were immunostained using the anti cyclin H specific monoclonal antibody ab54903. A: negative staining; B: GIST showing a fraction of positively stained cell nuclei; C: positivity of almost all cells with strong nuclear and faint cytoplasmic staining.
