SI病毒和R5 /NSI病毒在V3環氨基*序列方面，存在明顯的區別。
NEW DELHI: India is the fifth most powerful country in the world, says the latest national security index (NSI) designed by the country's foremost security and economic experts.
新德里：印度曾經是世界第五強國了，結論來自於印度*最頂尖的平安和經濟專家們所發佈的最新“國度平安指數”(NSI)。
There were obvious differences between X4/SI and R5/NSI viruses in env V3 loop sequences.
