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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.
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In which of the following condition PAS test has block positivity
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The correct answer is  Periodic acid - schiff (PAS) stain is useful for the diagnosis of ALLs and erythroid and megakoryocytic (M6 and M7) type of acute myeloid leukemia.
Block positivity in lymphoblast is oberved in ALL L1 cores.