GFAP and nasopharyngeal carcinoma: Interestingly, when tracing the cell origination, the ratio of Tuj1-, GFAP- and MBP-positive cells among tdTomato-positive cells were 41.7%, 22.8%, and 0%, respectively, very similar to the pure astrocyte culture; while the ratios of Tuj1-, GFAP- and MBP-positive cells among tdTomato-negative cells were 10.6%, 27.7% and 1.3%, respectively, also similar to the pure NPC culture (Fig. 2h–j).