Noun
neuromelanin (countable and uncountable, plural neuromelanins)
A dark pigment present in parts of the brain
In Parkinson's disease, a disorder that affects neuromotor functioning, there is decreased neuromelanin in the substantia nigra and locus coeruleus as consequence of specific dropping out of dopaminergic and noradrenergic pigmented neurons. Source: Internet
They occur in some red human hair. citation Neuromelanin Neuromelanin (NM) is a dark polymer pigment produced in specific populations of catecholaminergic neurons in the brain. Source: Internet
This hypothesis is supported by the fact that the loss of neuromelanin observed in Parkinson's disease is accompanied by an increase in iron levels in the brain. Source: Internet