TCRBV expression by CD4⁺CD57⁺ (▧), CD4⁺CD57⁻ (□), CD4⁻CD57⁺ (▪), and CD4⁻CD57⁻ (▧) cell subpopulations prepared from the RA patients ROPI, GEGU, LOME, and MAGHI. The data are expressed as percentage of the colorimetric signal obtained with the individual TCRBV specific probes and each graphic represents the mean of two independent experiments. Arrows indicate the TCRBV families in which the chain is abnormally expressed in at least one of the four T-cell subpopulations.