system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Fontana-Masson stain mainly stains   what granules  in the  cytoplasm
assistant
The correct answer is  Fontana masson  stains  mainly used to detect melanin granules in cytoplasm of tumour cells  of melanoma.