To validate these findings at the cellular level, qRT-PCR and Western blot analyses were performed using EBV-negative (AGS, MKN1, SNU216, and MKN45), naturally EBV-infected (SNU719 and YCCEL1), and artificially EBV-infected (AGS-EBV and MKN1-EBV) gastric cancer cell lines (Figure 1b–d). Here, JAG1 is linked to gastric cancer.