To determine if HNRNPL interacts with BUB1 3′UTR in B-CLL cells as occur in T cells (Figure S4), we performed RNA immunoprecipitation (RIP) analysis in HG-3 cells, a CLL cell line in which we transfected the vectors carrying the BUB1 3′UTR with either 18CA or 19CA (the most representative alleles) downstream of the luciferase reporter gene. Here, BUB1 is linked to B-cell chronic lymphocytic leukemia.