The Impact of Environmental Signals on the Growth and Survival of Human T Cells -- Novel Single Cell Fluorescence Approaches in the Investigation of Signaling at the Cellular Level -- Non-Random Patterns of Membrane Proteins and Their Roles in Transmembrane Signaling -- Transmembrane Signals Mediated by IL-2 and IL-15 Control the Life and Death of Lymphocytes -- Single-Molecule Imaging of Diffu…