T-cell activation: T-cell-APC interactions.

Discusses research being done on the interaction between T cells and antigen-presenting cells (APC). Reference to a study by Matthias Gunzer et al published in a 2004 issue of "Blood"; Use of a three-dimensional collagen-matrix system and intravital imaging to show that T cells can interact with different APCs; Result of the comparison of the kinetics of T cell activation with different types of APC.