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Dr. Peter Marks, director of the Center for Biologics Evaluation and Research, told the Food and Drug Administration he would leave by April 5.

Mr Marks has served as the director of the Center for Biologics Evaluation and Research within the FDA since 2016.

In fact, mirror peptides might prove extremely useful, for example by allowing biologics, an increasingly important category of medications, to work much better than they do now.

“I’m not convinced that Covid-19 human challenge models turned out to be critical to the effort to develop biologics, vaccines and therapeutics,” Lyke wrote in her email.

Trump said in a statement that Makary would “evaluate harmful chemicals poisoning our Nation's food supply and drugs and biologics being given to our Nation's youth.”