Cover photograph (Copyright © 2006, American Society for Microbiology. All Rights Reserved.): Interactions between a human dendritic cell and a human T-cell leukemia virus type 1 (HTLV-1)-infected lymphocyte. Human monocyte-derived dendritic cells (blue pseudocoloring) were incubated for 3 h with HTLV-1-infected lymphocytes (MT2 cell line; yellow pseudocoloring). A close interaction could be observed among cells by scanning electron microscopy. Original magnification, ×2,300. (See related article on page 4771.)