LEF1 and acute lymphoblastic leukemia: Since binding of TCF1 to the TCTCGCGAGA (associated with ZBTB33/Kaiso) has been previously reported in ES cells (De Jaime‐Soguero et al, 2017), we tested whether TCF1, LEF1 or Kaiso were recruited to β‐catenin target genes in T‐ALL cells.