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We thank D. Littman and J Hoxie for providing U87/ CD4 cells, and P. Clapham and G. Simmons for doing HIV-1 experiments. Supported by the Cancer Research Campaign; the Medical Research Council; the Japanese Ministry of Health and Welfare; the Japanese Ministry of Education, Sciences, Sports and Culture; the Wellcome Trust; The National Asthma Campaign; and NCI (CA 67391).
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