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“The possibility of removing from me an end that seemed to be waiting for me was given to me by a stranger who, out of pure altruism, gave me his bone marrow. What do I know about him? Very little: that at the time of the donation he was 19 years, 3 more than my son is now. Nothing else: I don’t know his name, nor have I ever seen his face, and I don’t know where he lives.