Acknowledgements
Our works summarized in this review were supported by a Grant-in-Aid for
Scientific Research from the Ministry of Education, Culture, Sports, Science
and Technology of Japan (MEXT) (23117001, 23117005, 23390099), a grant
from Global COE Program from MEXT, a grant for research on emerging
and re-emerging infectious diseases from the Ministry of Health, Labour
and Welfare of Japan, a grant for research to promote the development of
anti-AIDS pharmaceuticals from the Japan Health Sciences Foundation
(KHA1101) to T.N.