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Until now this is simply a small company doing a proof of concept on one individual with a very rare disease.

I mean, this is a very sophisticated proof of concept.

Sure, they address a smaller market but it's still a proof of concept.

I mean, this was a very cool research project at a university that showed a proof of concept.

"I would call what we did a proof of concept," he says.

Simple tests in the laboratory served as proof of concept.

A proof of concept or any other evidence for its claims was never published.

The study, he added, "was the proof of concept in every way."

And what's happened is there are now proofs of concept.

And it is - it's been done as a proof of concept.