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WASHINGTON, March 14, 2017 � St. Patrick’s Day evokes thoughts of all things often associated with the Irish � including red hair. Chemically speaking, what sets redheads apart from the crowd is pigmentation � specifically melanins. Most humans produce the brown-black eumelanin that results in varying shades of skin color and hair from blonde to black. Redheads have a genetic variant that causes cells to produce instead reddish pheomelanin, resulting in pale skin and fiery locks. How red hair is produced by redheads� cells might also explain why they have different sensitivity to pain. Watch the latest Reactions video here: .

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The American Chemical Öйú365betÖÐÎĹÙÍø is a nonprofit organization chartered by the U.S. Congress. With nearly 157,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.