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Methionylthreonylthreonyl…isoleucine (189,819 letters) is the third longest word in English, usually it is called Titin (also known as connectin) is a protein that is important in the contraction of striated muscle tissues. Titin is the largest known protein, consisting of 26,926 amino acids.

However, professional dictionary writers regard generic names of chemical compounds as verbal formulae rather than as English words.

Some illustrations:

Find out more about the video above here.

From video description: “Simplified model of cardiac sarcomere. Myosin, actin, troponins, tropomyosin, myosin binding protein C, myopadin, Zasp, titin, actinin and other proteins in the cardiac myofilaments are shown.”

Longest Words in English Top 14:

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