HEK293T cells were transfected with myc-tagged wild-type and mutant GFI1B cDNA using calcium phosphate method and maintained in DMEM medium (Euroclone, Pero, Italy) with 10% fetal bovine serum. Protein fractionated cell extracts were analyzed by western blot using primary antibodies anti-myc (9E10; sc-40; Santa Cruz Biotechnology, Dallas, TX, USA), anti-HSP90 (sc-7947; Santa Cruz Biotechnology), anti-ORC2 (ab68348; Abcam, Cambridge, UK); as previously described.23 (link)