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A histologist sections off pieces a tenth the thickness of a human hair.

In one study, world-renowned histologist Christopher Dean teamed up with his former student Wendy Birch to analyze the baby teeth of a colleague’s twins.

He shared it with the Italian histologist Camillo Golgi, who had devised a new method of staining tissue that singled out individual cells under the microscope instead of presenting tangled illegible masses.

“I really love being part of the process,” said Bliss, 33, a histologist at Emory University’s Yerkes National Primate Research Center, which conducts biomedical and behavioral studies.

Even Santiago Ramón y Cajal—the Barcelona-based histologist who essentially invented modern neuroscience at the end of the 19th century—declared such neural renewal impossible.