So if “[a]lmost half of the DNA found on the [New York City Subway] system’s surfaces did not match any known organism and just 0.2 percent matched the human genome,” then where does it come from? Anyone? From the New York Times:
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Have you ever been on the subway and seen something that you did not quite recognize, something mysteriously unidentifiable?
Well, there is a good chance scientists do not know what it is either.
Researchers at Weill Cornell Medical College released a study on Thursday that mapped DNA found in New York’s subway system — a crowded, largely subterranean behemoth that carries 5.5 million riders on an average weekday, and is filled with hundreds of species of bacteria (mostly harmless), the occasional spot of bubonic plague, and a universe of enigmas. Almost half of the DNA found on the system’s surfaces did not match any known organism and just 0.2 percent matched the human genome.