Composition of GD2–T-cell products. The cellular composition of GD2-CTL (A) and GD2-ATC (B) lines was analyzed using flow cytometry. Both products were polyclonal with a predominance of CD8⁺ T cells, followed by a smaller percentage of CD4⁺ cells and NK cells within each product line. Furthermore, as expected, GD2-CTL lines were terminally differentiated and composed of mostly effector memory cells (C), whereas GD2-ATCs (D) had a higher percentage of naive and central memory cells within each T-cell line.