Figure 10. MTT assay of ARPE-19 cells. The columns represent the relative viability (negative siRNA fixed to 100%). Cells were exposed to 5 µM MG-132 with p62 or hsp70 siRNA for 24 h and then allowed to recover in normal cell culture medium. Variations are represented by standard deviation (n=4); p values below 0.05 (*) were considered significant in the Mann–Whitney U test.