PTBP3 and gastric cancer: We also selected MKN45 cells for lentiviral infection to establish control and PTBP3‐overexpressing cell lines, and SNU‐1 cells for plasmid transfection to create control and PTBP3‐knockout cell lines, based on PTBP3 expression levels in commonly used gastric cancer cell lines (Figure S6b–d, Supporting Information).