Section of Immunology, Imperial College London, London, United Kingdom.|Molecular and Cellular Biology, Université de Liège and GIGA, Gembloux Agro-Bio Tech, Liège, Belgium.|Molecular and Cellular Biology, Université de Liège and GIGA, Gembloux Agro-Bio Tech, Liège, Belgium.|Section of Immunology, Imperial College London, London, United Kingdom.