In GliNS1 neural tumor cells and human umbilical vein endothelial cells (HUVECs), HCMV infection upregulates class I (HERV-T, HERV-W, HERV-F, ERV-9), class II (HERV-K) and class III (HERV-L) retroelements [57]. The gene discussed is ERVW-1; the disease is cytomegalovirus infection.