Priscilla Chan's unglamorous quest to fight disease. (Mark is involved, too.)

Priscilla Chan's unglamorous quest to fight disease. (Mark is involved, too.)

Priscilla Chan charts an ambitious, unglamorous course to fight disease. (Her husband is involved, too.)

By REBECCA ROBBINS

JUSTIN SULLIVAN/GETTY IMAGES

The pediatrician and philanthropist insists the goal the couple has set — to “cure, prevent, or manage all diseases” by the year 2100 — is a realistic one.

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