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T-helper cell proliferation responses after coinjection with adhesion molecule genes. Mouse lymphocytes were isolated as described in Methods and tested against (a) recombinant gp120 protein (5 and 1 μg/ml final concentrations) or against (b) recombinant p24 protein (5 and 1 μg/ml final concentrations). Background counts per minute from the control vector group were 200–400.
