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Crohn's Disease
Stephen Crohn dies at 66; immune to HIV, but not its tragedy
Stephen Crohn dies at 66; immune to HIV, but not its tragedy

Three decades ago, when so many of his friends were dying of AIDS, Stephen Crohn wondered why he—a gay man whose longtime companion had been one of the first to die from the disease--had managed to avoid it. Was it just a matter of time before he caught the human immunodeficiency virus that causes AIDS? Was there something wrong with the HIV antibody tests he took that always came back negative? Crohn, an artist and freelance editor, lived with the questions for 14 years before he finally learned the answer was in his genes. In 1996, scientists in New York studying Crohn's blood cells discovered he had a genetic mutation that made his cells impregnable to the AIDS virus. The...

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