Author information:
(1)Section of Virology, Division of Infectious Diseases, Imperial College, 
London W2 1PG, United Kingdom; Centre for AIDS Research, Kumamoto University, 
Kumamoto 860-0811, Japan; Priority Organization for Innovation and Excellence, 
Kumamoto University, Kumamoto 860-0811, Japan; International Research Centre for 
Medical Science, Kumamoto University, Kumamoto 860-0811, Japan; Core Research 
for Evolutionary Science and Technology, Japan Science and Technology Agency, 
Saitama 332-0012, Japan; c.bangham@imperial.ac.uk y-satou@kumamoto-u.ac.jp.
(2)Centre for AIDS Research, Kumamoto University, Kumamoto 860-0811, Japan; 
Priority Organization for Innovation and Excellence, Kumamoto University, 
Kumamoto 860-0811, Japan; International Research Centre for Medical Science, 
Kumamoto University, Kumamoto 860-0811, Japan;
(3)Priority Organization for Innovation and Excellence, Kumamoto University, 
Kumamoto 860-0811, Japan; Core Research for Evolutionary Science and Technology, 
Japan Science and Technology Agency, Saitama 332-0012, Japan;
(4)Section of Virology, Division of Infectious Diseases, Imperial College, 
London W2 1PG, United Kingdom;
(5)Cancer Centre, Kumamoto University Hospital, Kumamoto University, Kumamoto 
860-0811, Japan;
(6)Department of Medical Cell Biology, Institute of Molecular Embryology and 
Genetics, Kumamoto University, Kumamoto 860-0811, Japan.
(7)Core Research for Evolutionary Science and Technology, Japan Science and 
Technology Agency, Saitama 332-0012, Japan; Department of Medical Cell Biology, 
Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto 
860-0811, Japan.
(8)Section of Virology, Division of Infectious Diseases, Imperial College, 
London W2 1PG, United Kingdom; c.bangham@imperial.ac.uk 
y-satou@kumamoto-u.ac.jp.