METTL14 and lymphoproliferative syndrome: Immunohistochemistry for METTL14 expression showed that it was clearly up-regulated in EBV-positive Post-transplant lymphoproliferative disorders (PTLDs) tumor tissues and that EBNA3C signals were also clearly detected in the EBV-positive tissues compared to EBV negative tissues (Fig 5, compare panels 5E and 5F).