The chain’s chicken meat contains only about half real chicken DNA, according to the results of an investigation commissioned by Canada’s CBC News. The rest is mostly soy, the CBC says.

It’s often reported that fast food chicken has added ingredients. But Subway says the CBC’s claims are false, at least concerning its chicken served in both the U.S. and Canada.

“The accusations made… about the content of our chicken are absolutely false and misleading,” a Subway spokesman told HuffPost in a statement. “Our chicken is 100% white meat with seasonings, marinated and delivered to our stores as a finished, cooked product… We do not know how [CBC News] produced such unreliable and factually incorrect data, but we are insisting on a full retraction.”

The news report includes results from DNA tests of chicken at a number of fast-food restaurants. McDonald’s and Wendy’s were found to have around 85 percent chicken DNA in their products. Subway’s results were dramatically lower: Its oven roasted chicken was found to have 53.6 percent chicken DNA, and its chicken strips came out to just 42.8 percent.

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