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The tissue sources of gp120 immunogens identified in different Nab subgroups. The numbers shown are percentages of each source in a particular subgroup. The sum of all sources within one subgroup equals to 100%. The statistical significance is calculated using Fisher exact test for the difference of one source between broad and moderate subgroups, or between broad and narrow subgroups, # indicating p < 0.01 and * indicating p < 0.05.
