D EMSA of the Max bHLH-LZ construct alone (at 2 μM) or in the presence of either Myc construct (MycWT, MycHEA or MycRA, all at 6 μM). The polypeptides were incubated in presence of 500 nM of the fluorescently-labeled IRD-CACGTG probe and the complexes separated on a native polyacrylamide gel, as described (Beaulieu et al., 2012). 