NEW YORK (WABC) -- The neighborhood you live in likely determines the type of rat you encounter in New York City.
Matthew Combs, a graduate student at Fordham University, studied the DNA of New York City rats and discovered "Uptown" rats are genetically different from "Downtown" rats. There is even a difference between rodents in the East and West Villages.
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Rats in Midtown, for example, showed a high level of inbreeding.