melanin
noun
- Any of various black, brown, reddish-brown, reddish-yellow, or yellow pigments of living organisms that in animals are typically produced in melanocytes by the oxidation of tyrosine followed by polymerization and are found especially in skin, hair, feathers, and eyes
"Scientists know that all melanin molecules consist of long chains made mostly of derivatives of the amino acid tyrosine, but the individual units of the chain connect in random order."
Source: merriam-webster.com
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