They have CD3 and two major types of them are distinguished by whether they have CD4 or CD8.  
The AIRE gene is expressed in cells that help these cells mature. The receptor of these cells interacts with a complex that has two epsilon chains, along with a delta and gamma chain. Lck and ZAP-70 are important to this type of cell's signaling pathway. Unlike an associated class of cells, they undergo both positive and negative selection. A very small percentage of these cells are known as delta-gamma cells. FOXP3 acts as a marker for regulatory ones. They have CD3 and two major types of them are distinguished by whether they have CD4 or CD8.  For 10 points, name these lymphocytes that come in cytotoxic and helper varieties, which are not B cells.
The AIRE gene is expressed in cells that help these cells mature.
T cells