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Nae tae be confused wi melamine or melatonin.
Melanin pigment (light refracting granular material - center of image) in a pigmented melanoma.

Melanin Listeni/ˈmɛlənɪn/ (Greek: μέλας - melas, "black, dark") is a broad term for a group o naitural pigments foond in maist organisms (arachnids are ane o the few groups in which it haes nae been detectit).