MAPK9 and colorectal carcinoma: The expression levels of the three main MAPK proteins, JNK2 (pT183/pY185), p38α (pT180/pY182), and ERK1 (pT202/pY204), were determined in Ru/5-FU-treated HCT116 CRC cells after acute (15 and 30 min) and prolonged (24 h) incubation.