Comparison of Vβ5.1 and Vβ6.7 expression in CD4⁺Fas^lo and CD4⁺Fas^hi thymocytes from six MG patients. CD8-depleted thymocytes were labeled with anti-Fas, PE-coupled anti-CD4, FITC-coupled anti-Vβ5.1 or -Vβ6.7. After setting gates to define Fas^lo and Fas^hi cells, Vβ5.1 and Vβ6.7 expression was analyzed in these gates and compared by using the Wilcoxon test. Vβ5.1-expressing cells were enriched in Fas^hi cells compared with Fas^lo cells, whereas Vβ6.7-expressing cells were equally represented in both populations.