On the cover: The white pulp area of the spleen of CD30^–/– mice. B lymphocytes are shown in green and ER-TR7⁺ stromal cells are shown in red. Normal development of both stromal cells and lymphocytes is necessary for maintenance of the microarchitecture of the white pulp. Bekiaris, V., D. Withers, S. H. Glanville, F. M. McConnell, S. M. Parnell, M.-Y. Kim, F., M. C. Gaspal, E. Jenkinson, C. Sweet, G. Anderson, and P. J. L. Lane. 2007. Role of CD30 in B/T segregation in the spleen. J. Immunol. 179: 7535–7543.