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Boneless lean beef trimmings, used as ground-beef filler but known as "pink slime" to critics, awaits packaging at Beef Products Inc. The product is made from fatty leftover meat bits heated to about 100 F, spun to remove fat, compressed and exposed to a small amount of ammonium hydroxide gas to kill bacteria. (Associated Press)

Boneless lean beef trimmings, used as ground-beef filler but known as "pink slime" to critics, awaits packaging at Beef Products Inc. The product is made from fatty leftover meat bits heated to about 100 F, spun to remove fat, compressed and exposed to a small amount of ammonium hydroxide gas to kill bacteria. (Associated Press)

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