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Background: A 32-base pair (bp) deletion mutation in the betachemokine receptor CCR5 gene has been associated with resistance against human immunodeficiency virus type 1 (HIV-1) infection and disease. Large-scale studies conducted among Caucasians indicate that individuals who are homozygous for this deletion mutation (Δ32/Δ32) are protected against HIV-1 infection despite multiple high-risk exposures,...
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