Melanin

Broadly, melanin is any of the polyacetylene, polyaniline, and polypyrrole "blacks" or their mixed copolymers. The most common form of biological melanin is a polymer of either or both of two monomer molecules: indolequinone, and dihydroxyindole carboxylic acid. In contrast, some fungal melanin is polyacetylene black. Melanin exists in the plant, animal and protista kingdoms, where, among other functions, it serves as a pigment. The presence of melanin in the archaea and bacteria kingdoms is an issue of ongoing scholarly disagreement.

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Polymer: A polymer is a generic term used to describe a substantially long molecule. This long molecule consists of structural units and repeating units strung together through chemical bonds. The process of converting these units to a polymer is called polymerization. These units consist of monomers, which ...

Monomer: In chemistry, a monomer (from Greek mono "one" and meros "part") is a small molecule that may become chemically bonded to other monomers to form a polymer....

Molecules: REDIRECT Molecule...