I. Introduction.- 1. Summary of T Cell Studies Performed during the Second International Workshop and Conference on Human Leukocyte Differentiation Antigens.- II. Functional Studies.- 2. Binding and Functional Analysis of the Workshop T Cell Specific Set of Monoclonal Antibodies.- 3. Functional Studies Performed with the Second International Workshop T Cell Panel of Monoclonal Antibodies.- 4. The Epitopic Dissection of the CD2 Defined Molecule: Relationship of the Second Workshop Antibodies in Terms of Reactivities with Leukocytes, Rosette Blocking Properties, Induction of Positive Modulation of the Molecule, and Triggering T Cell Activation.- 5. Monoclonal Antibodies as Probes to Define Critical Surface Structures Involved in T Cell Activation.- 6. The Development of Monoclonal Antibodies against Human Immunoregulatory T Cell Subsets: The Isolation of Human Suppressor Inducer T Cell Subset.- 7. Lectin Activation Induces T4, T8 Coexpression on Peripheral Blood T Cells.- 8. Analysis of the Ontogeny and Function of Human Helper T Cell Subpopulations.- 9. Effects of Workshop Monoclonal Antibodies on the Cytolytic Activity of Alloreactive CD4-Positive T Cell Clones.- 10. Effects of the Workshop Anti-T Cell Monoclonal Antibodies on Lymphocyte Proliferative and Cytotoxic Functions.- 11. T Cell Activation by CD3 Antibodies.- 12. Studies of T Cell Proliferation Induced by Monoclonal Antibodies of the Second International Workshop.- 13. Phorbol Ester Induces Changes in the Pattern of Cell Surface Molecules Involved in CTL-Target Cell Interaction.- 14. Analysis of the Monocyte-T Cell Interaction Required for Induction of T Cell Proliferation by Anti-T3 Antibodies.- 15. Evaluation of the T Cell Workshop Monoclonal Antibodies in In Vitro Lymphocyte Proliferation Assays.- 16. The Influence of the Workshop Monoclonal Antibodies on CML, AgTR, PLT, ADCC, and NK Cell Activity. Functional Studies with Workshop Antibodies.- 17. The Influence of Anti-T Cell Monoclonal Antibodies on Callƒ&