Anti-CD123 CAR T cells (effectors) and KG1a cells (targets) were co-cultured at a E:T ratio of 10:1 at 37 °C for 24 h. For controls, SUPB15 cells were used as CD123− targets. The supernatant was harvested and stored in single-use aliquots at −80 °C until use. The supernatant was analyzed using the human 30-plex milliplex kit according to the manufacturer’s protocol (Merck Millipore).
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