MGAT3 and breast cancer: To explore the roles of bisecting GlcNAc in BC chemoresistance, we introduced MGAT3 into MDA-MB-231, MCF7 and MCF7DOX cells (termed as MB231/MGAT3, MCF7/MGAT3 and MCF7DOX/MGAT3) to enhance bisecting GlcNAc levels (Fig. S3A).