The human NEC cell line SS-2 was previously established [6 (link)]. The SS-2 cells and other conventional CRC cell lines, HT-29-Luc (JCRB Cell Bank, Osaka, Japan), DLD-1 (Cell Resource Center for Biomedical Research, Tohoku University), Colo-320 (Riken BRC Cell Bank), and Caco-2 (Riken BRC Cell Bank), were grown in RPMI 1640 medium containing 10% fetal bovine serum (Thermo Fisher Scientific, Waltham, MA, USA) at 37 °C in a humidified 5% CO2 atmosphere. For EMT induction, the cells were cultured in growth medium with 10 ng/mL TGF-β1 (Peprotech, Rocky Hill, NJ, USA) for 48 h.
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