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[ad_1] A canker sore—a painful white ulcer inside the mouth—might be brought on by stress. Or the wrong toothpaste. Or certain foods: tomatoes, peanuts, cinnamon. Or...
[ad_1] In the fall of 1988, Matthew Farrow, a 5-year-old boy with a rare blood disorder, received the world’s first transplant of umbilical-cord blood from a...