thumb|5,6-Dihydroxyindole, the monomer out of which neuromelanin polymers are formed Neuromelanin (NM) is a dark pigment found in the brain which is structurally related to melanin. It is a polymer of 5,6-dihydroxyindole monomers. Neuromelanin is found in large quantities in catecholaminergic cells of the substantia nigra pars compacta and locus coeruleus, giving a dark color to the structures.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).