Table 1.

B7 Family ligand and receptors.

Ligand	Receptor	T Cell Fate
B7-1	CD28	+
B7-1	CTLA4	–
B7-2	CD28	+
B7-2	CTLA4	–
PD-L1 (B7-H1)	PD-1	–
PD-L2 (B7-DC)	PD-1	–
B7-H2	ICOS	+
B7-H3	?	–
B7-H4	?	–
B7-H5	CD28H	±
B7-H6	NKp30	+*
B7-H7	?	–

^*NK cell fate.