Subway

Subway is an American multinational fast food restaurant franchise that specializes in submarine sandwiches (subs), wraps, salads and drinks.

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A recent report by the New York Times found that Subway's tuna sandwich had "no amplifiable" tuna DNA -- but molecular ecologist Karen James tells Inverse that's not as scary as it sounds. From faulty PCR tests to gloopy mayonnaise, James explores the reasons why tuna DNA may be hard to determine.