(Received and Accepted Dates Follow Title)Stimulation of T-Cell Activation by CXCL12/Stromal Cell Derived Factor-1 Involves a G-Protein Mediated Signaling Pathway. Toshihiro Nanki and Peter E. Lipsky. (Received 8/14/01; acepted 1/25/02.)The COX-2 Inhibitor NS-398 Causes T Cell Developmental Disruptions Independent of Cox-2 Enzyme Inhibition. Hui Xu, David J. Izon, Charles Loftin, and Lisa M. Spain. (Received 10/17/01; accepted 1/25/02.)Analysis of the Individual Role of the TCR Chain in Transgenic Mice after Conditional Activation with Chemical Inducers of Dimerization. Gloria Soldevila, Carlos Castellanos, Marie Malissen, and Leslie J. Berg. (Received 9/17/01; accepted 1/28/02.)Antigen Presentation of a Modified Tumor-Derived Peptide by Tumor Infiltrating Lymphocytes. Sara O. Dionne, Margaret H. Smith, Francesco M. Marincola, and Douglas F. Lake. (Received 10/10/01; accepted 1/28/02.)B Cells of Aged Mice Show Decreased Expansion in Response to Antigen, but Are Normal in Effector Function. Ryan W. Dailey, So-Young Eun, Courtney E. Russell, and Laura A. Vogel. (Received 9/17/01; accepted 1/28/02.)Observation of Antigen-Dependent CD8+ T Cell/Dendritic Cell Interactions in Vivo. Brian C. Schaefer, Michele L. Schaefer, John W. Kappler, Philippa Marrack, and Ross M. Kedl. (Received 11/1/01; accepted 1/28/02.)Involvement of Tumor Necrosis Factor-related Apoptosis-inducing Ligand in NK Cell-mediated and IFN-γ-dependent Suppression of Subucutaneous Tumor Growth. Kazuyoshi Takeda, Mark J. Smyth, Erika Cretney, Yoshihiro Hayakawa, Noriko Yamaguchi, Hideo Yagita, and Ko Okumura. (Received 12/4/01; accepted 1/28/02.)Intercellular Exchange of Class II MHC/Peptide Complexes Is a Conserved Process That Requires Activation of T Cells but Is Constitutive in Other Types of APC. Dhaval M. Patel and Mark D. Mannie. (Received 10/5/01; accepted 2/1/02.)Measles Virus Exploits Dendritic Cells to Suppress CD4+ T Cell Proliferation Via Expression of Surface Viral Glycoproteins Independently of T Cell Trans-Infection. Bertrand Dubois, Pierre Jean Lamy, Karine Chemin, Alain Lachaux, and Dominique Kaiserlian. (Received 10/10/01; accepted 2/1/02.)Plasmid DNA Induces Increased Lymphocyte Trafficking: A Specific Role for CpG Motifs. Richard R. E. Uwiera, Volker Gerdts, Reno A. Pontarollo, Lorne A. Babiuk, Dorothy M. Middleton, and Philip J. Griebel. (Received 7/6/01; accepted 2/8/02.)