2.1. Cell Culture

The human lymphoma cell line Jurkat (ACC282) and the human lymphoblast cell line TK6 (ATCC CRL-8015) were used. The cells were cultured in Dulbecco’s Modified Eagle’s Medium (DMEM; PAN-Biotech, Aidenbach, Germany) or Roswell Park Memorial Institute (RPMI) 1640 medium (PAN-Biotech, Aidenbach, Germany), each containing 10% fetal bovine serum (Sigma-Aldrich-Chemie, Taufkirchen, Germany), 1% glutamine (PAN-Biotech), and 1% penicillin/streptomycin (PAN-Biotech, Aidenbach, Germany) at 37 °C and 5% CO₂. Before the treatment, the cells were seeded at 5 × 10⁴ in 100 µL DMEM into 96-well round bottom plates (Thermo Fisher Scientific, Dreieich, Germany). For a different set of experiments, 2.5 × 10⁵ cells in 500 µL of RPMI medium were seeded into flat-bottom 24-well plates (Eppendorf, Hamburg, Germany).