On the cover: Confocal microscopy of the thymus of wild-type mice reconstituted with G184S bone marrow previously immunostained for CD3 (blue), CD4 (green), CD8 (red), and UEA1 (white). The section shown is captured from the tiled entire thymus image. Hwang, I.-Y., C. Park, K. Harrison, and J. H. Kehrl. 2017. Normal thymocyte egress, T cell trafficking, and CD4⁺ T cell homeostasis require interactions between RGS proteins and Gα_i2. J. Immunol. 198: 2721–2734.