STAT3 and nasopharyngeal carcinoma: To detect if LPS+HIV-MCM induce STAT3 activation in differentiated astrocytes, which exist in NPC culture at a low percentage (less than 10%), we treated NPCs with LPS+HIV-MCM and did immunocytochemical studies using antibodies for p-STAT3 and GFAP, an astrocyte marker (Figure S1G–I).