FIG. 1.

Surface coreceptor expression of CD4 or CD8 on CD3⁺CD56⁺ T cells. For detecting cell surface expression of CD4 and CD8, purified CD56⁺ T cells were labeled with FITC-conjugated anti-CD4 or anti-CD8 and PE-conjugated anti-CD56 or isotype-matched control antibodies and analyzed by flow cytometry. Results are presented as frequencies of coreceptor expression (mean value), with CD8⁺ > CD4⁻CD8⁻ > CD4⁺ > CD4⁺CD8⁺.