Table 1. List of major constructs used in the text.

Construct #	Description	Modality
254	CAR sequence targeting CD19	Anti-CD19 CAR
340	Stabilized CD19 ECD–anti-Her2	Purified BP
374	Sequence of 254 –P2A –sequence of 340	Anti-CD19 CAR + stabilized BP
390	CAR sequence targeting Her2	Anti-Her2 CAR
460	Anti-Her2 –stabilized CD19 ECD–anti-EGFR	Purified BP

Constructs are presented in the numerical order with a description of the encoded sequences in column 2 and the format in which the expressed sequence is utilized in column 3. The long dashes indicate a linker sequence. P2A refers to a cleavage sequence. BP refers to a bridging protein.