CD8B and diffuse large B-cell lymphoma: To determine whether the loss of viability was due to selectively induced apoptosis, we treated ABC-DLBCL (OCI-Ly3, TMD8) and GCB-DLBCL (OCI-Ly1) cells with 1 μM M1i-124 for up to 8 days and quantified apoptotic cells by annexin V and SYTOX Blue (Thermo Fisher Scientific) staining.