Three miles north of Ground Zero, inside a lab with sterilized air and so little humidity that the simple act of breathing parches your throat, Mark Desire devotes himself to keeping a vow that turns 25 this year.

“We made a promise that we would never give up,” Desire, assistant director at the City of New York Office of Chief Medical Examiner, told The Post of himself and a team of scientists, technologists and anthropologists that has been working all this time to find, identify and return remains of 9/11 victims to their loved ones. “We promised those families that we would continue to advance the technology and never give up. That…

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