Different expression pattern of BLR1 on γ/δ⁺ T cells (A) and on B cells (B) during the progression of AIDS. The BLR1-phenotype of peripheral blood B cells was determined as described for Fig 1 using anti-BLR1 MoAb and either anti-γ/δ MoAb or anti-CD19 MoAb. HIV⁺ individuals were grouped according to the Walter Reed classification. Results of each experiment (▴) and the mean ± SEM for each group are shown (Mann-Whitney test with Bonferroni-Holm conditions, α = .05).