Of all the drugs so far developed for AIDS patients, the one called CD4 is unique: it is the first substance designed specifically to combat the human immunodeficiency virus, which causes AIDS. A synthetic copy of a natural protein, CD4 prevents the deadly virus from entering and infecting healthy cells. While it cannot destroy the invader, scientists hope that CD4 can neutralize its ability to attack the human immune system. Says Samuel Broder, a National Cancer Institute researcher who is a leader in AIDS drug development: "It is one of the most important steps we have ever been able to take."
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