FILE - In this March 29, 2012 file photo, the beef product known as lean finely textured beef, or "pink slime," is displayed during a plant tour of Beef Products Inc. in South Sioux City, Neb., where the product is made. Gerald Zirnstein, the microbiologist who coined the term "pink slime," says it came to him in the spur of the moment as he was composing an email to a coworker at the U.S. Department of Agriculture a decade ago. Although it's been used as a filler for decades, the product became the center of controversy only after Zirnstein's vivid moniker for it was quoted in a 2009 New York Times article on the safety of meat processing methods. (AP Photo/Nati Harnik, File)

Associated Press
FILE - In this March 29, 2012 file photo, the beef product known as lean finely textured beef, or "pink slime," is displayed during a plant tour of Beef Products Inc. in South Sioux City, Neb., where the product is made. Gerald Zirnstein, the microbiologist who coined the term "pink slime," says it came to him in the spur of the moment as he was composing an email to a coworker at the U.S. Department of Agriculture a decade ago. Although it's been used as a filler for decades, the product became the center of controversy only after Zirnstein's vivid moniker for it was quoted in a 2009 New York Times article on the safety of meat processing methods. (AP Photo/Nati Harnik, File)
FILE - In this March 29, 2012 file photo, the beef product known as lean finely textured beef, or "pink slime," is displayed during a plant tour of Beef Products Inc. in South Sioux City, Neb., where the product is made. Gerald Zirnstein, the microbiologist who coined the term "pink slime," says it came to him in the spur of the moment as he was composing an email to a coworker at the U.S. Department of Agriculture a decade ago. Although it's been used as a filler for decades, the product became the center of controversy only after Zirnstein's vivid moniker for it was quoted in a 2009 New York Times article on the safety of meat processing methods. (AP Photo/Nati Harnik, File)
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