Table 1.

Cell surface proteins monitored in figure 4 and their functions.

Marker	Function
NK-T cell markers:
NK1.1	Marker expressed by NK and NK-T cells [36;37]. Present on C57BL/6 mice, but not on Balb/c. Expression is correlative to DX5 on C57BL/6 mice.
DX5	Pan-NK marker that recognizes CD49b (alpha 2 integrin, very late antigen-2) [38]. Co-expressed with NK1.1 in C57BL/6 mice.
Molecules involved in memory responses:
CD25	IL-2 receptor alpha chain. Binds with high affinity to soluble IL-2 and acts in coordination with the beta-gamma receptor chains to initiate intracellular signals [44;45].
CD44	Adhesion molecule found on lymphocytes that is associated with memory T cells, up regulated during homeostatic proliferation and activation [40;41].
CD62L	Adhesion molecule that is a member of the selectin family and is associated with memory T cell homing to the lymphoid organs [42;43].
CD122	IL-2/15 receptor beta chain, up regulated on memory phenotype T cells and during activation [26;39].