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Elicited antibodies recognize the inner domain of gp120. Indirect ELISA on (A) gp120core and (B) ID2 using immunized guinea pig sera (1:10 000 dilution). Data shown is the mean of four independent experiments. Error bars represent the standard error of the mean. Differences between groups were compared using unpaired t-test (n.s., not significant; *** p < 0.001; **** p < 0.0001). R.L.U., Relative light units.
