Affiliation: | aB Cell Molecular Immunology Section, Laboratory of Immunoregulation, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA;bBiological Imaging Section, Research Technologies Branch, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA;cDepartment of Microbiology, Tumor, and Cell Biology, Karolinska Institutet, Stockholm, Sweden |