Abstract
An Epstein-Barr virus (EBV) genome-positive epithelial hybrid cell line, NPC-KT, derived from the fusion of primary nasopharyngeal carcinoma cells with a human epithelial cell line of adenoid origin has previously been described (Takimoto, Kamide, and Umeda, 1984a; Takimoto, Ogura, Sato, and Hatano, 1984b; Takimoto, Ogura, Sato, Umeda, and Hatano, 1985). The NPC-KT cells produce virus (NPC virus) with both transforming and lytic properties. An EBV genome-negative human lymphoblastoid cell line, Ramos, was infected with NPC virus. Three months after infection, more than 90 % of the cell population expressed EBV-associated nuclear antigen (EBNA). Approximately 40% of the cells exhibited a brilliant pattern, whereas the remaining 50% of the cells showed a faint granular pattern. The result suggests that there may be heterogeneity in NPC virus.
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