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neuromelanin
neuromelanin n.
Brit. 
/ˌnjʊərə(ʊ)ˈmɛlənɪn/
, /ˌnjʊərə(ʊ)ˈmɛlənɪn/U.S. /ˌn(j)ʊroʊˈmɛlənən/
Biochemistry a complex, dark-coloured pigment found especially in catecholaminergic neurons of the substantia nigra and locus coeruleus./ˌn(j)ʊroʊˈmɛlənən/ΚΠ
1957 Jrnl. Histochem. & Cytochem. 5 328 The ferric ferricyanide reaction of human neuromelanin was unaffected by a 4 hour nitrosation.
1966 Lancet 31 Dec. 1467/1 We have examined four adult [olfactory] bulbs and proximal tracts in detail as part of a larger study of the location of human neuromelanin in patients without disease of the central nervous system.
1993 Jrnl. Neurochem. 61 68/1 Neuromelanin is a poorly defined pigment..that accumulates normally with age in the central catecholaminergic neurons of most species.
1997 Guardian 8 Nov. (Weekend Suppl.) 44/1 This..might be explained by a correlation between the amount of the pigment melanin in the iris and the amount of neuromelanin—a substance that is thought to speed up nerve impulses—in the central nervous system.
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