Figure 3.
Characteristic flow cytometric findings in autoimmune lymphoproliferative syndrome (ALPS). A-B) The peripheral blood of ALPS patients will show an expanded population of CD3+ T-cells that are negative for both CD4 and CD8 (double negative, highlighted in red). C) The population of double negative T-cells should be positive for alpha-beta (α/ß) T-cell receptor (TCR).