PNA induced ubiquitination of luciferase Western blots detailed the expression of (A) luciferase, and (B) high molecular weight luciferase after 72h dosage of PNAs in HT-29-luc cells. Additionally, cells were dosed as indicated with MG132 proteasome inhibitor for 6h before cell lysis. Cellular expression of luciferase was compared with beta tubulin. * denotes that the column is significantly different from the no particle, no MG132 condition (p