Pyrroloquinoline quinone (PQQ), a new type of redox coenzyme, has similar physiological functions to vitamins. In 1979, American microbiologists Duine and Salisbury isolated the coenzyme from bacteria, determined its structural formula, and named it pyrroloquinoline quinone. In 2004, scientists discovered the presence of PQQ in comet dust and speculated that PQQ and many other molecules arrived on Earth with comet dust billions of years ago, helping the Earth to produce life. Modern research has also found that the active ingredient in the "immortal medicine" Tai Sui is PQQ.
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