CFP and acute lymphoblastic leukemia: The activation of 1E9 TCR+ CD8αβ+ JE6.1 reporter cells in response to targets expressing CD20 (ALL CM and K562 HLA-A2+CD20) and KL14 TCR+ CD8αβ+ JE6.1 reporter cells in response to targets expressing CTAG1 (UM3 and U266) was assessed by measuring the upregulation of CFP and GFP (Fig. 3, B and D).