On the cover: Representative image of an immunofluorescently labeled spleen section 24 h after anti-MARCO Ab treatment showing marginal zone macrophages (SIGN-R1⁺, blue) and marginal zone B cells (B220⁺, red) situated outside the metallophilic macrophages (MOMA-1⁺, green) lining the marginal sinus and follicular B cells (B220⁺, red). Prokopec, K. E., A.-M. Georgoudaki, S. Sohn, F. Wermeling, H. Grönlund, E. Lindh, M. C. Carroll, and M. C. I. Karlsson. 2016. Cutting edge: marginal zone macrophages regulate antigen transport by B cells to the follicle in the spleen via CD21. J. Immunol. 197: 2063–2068.