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RT @DrMarkOng: The rounded nests of cells is a clue. These are Zellballen. The pigment is another clue. Don't know if it's true melanin, b…
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The rounded nests of cells is a clue. These are Zellballen. The pigment is another clue. Don't know if it's true melanin, but melanin-like pigment can be seen in paragangliomas, so-called pigmented paragangliomas. This paper calls it "neuromelanin": http