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INSM1 immunostaining in nonneoplastic brain. (A) The normal adult pineal gland shows punctate cytoplasmic staining with A8. (B) The normal pituitary gland shows variable amounts of nuclear staining. (C) Specific nuclear staining seen in balloon cells a case of focal cortical dysplasia. (D) Nonspecific cytoplasmic INSM1 immunostaining is frequently seen in erythrocytes and macrophages. Scale bar = 20 µm.
