Rat embryonic motor neurons (Rat eMNs) were isolated as described in the Methods section. Rat eMNs were plated and treated with 300 nM CDDO-TFEA (Figure 4B, D) or DMSO (Figure 4A, C) for 24 hours. These cells were washed, fixed and then stained for Nrf2 using anti-Nrf2 (Figure 4A,B). Double immunofluorescence was performed to study nuclear translocation of Nrf2. CDDO-TFEA incubation led to a reduction of cytoplasmatic Nrf2 staining (green fluorescence) and increased nuclear colocalization (Figure 4 C,D).