In November, Celgene said it had been told by the FDA that the agency needed additional data related to writing proper safety labeling for the drug.

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Referring to the horsemeat controversy, British Prime Minister David Cameron tweeted: "this is completely unacceptable - this isn't about food safety but about proper food labeling (and) confidence in retailers, " according to his press office's Twitter account.

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The critical requirement is transparency, which means proper identification and labeling.

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