COPS6 and colorectal carcinoma: Immunoblotting analysis showed that EGF treatment decreased the steady‐state expression of FOXO4 within 45 min (Figure 1A, Figure S1A, Supporting Information) and accelerated turnover rate of FOXO4 (Figure S1B, Supporting Information) in several CRC cell lines, whereas the EGF induced the expression of CSN6 and COP1, an E3 ligase, within that period of time (Figure 1A, Figure S1A, Supporting Information).