Table 1. Summary of Currently Identified Members of the LILR Family.

Group	Type	Receptor	Aliases (according to ref. [6])	Ligand
Group 1 (>70% similarity to LILRB1/B2; conserved HLA class I binding sites)	ITIM adaptor molecules	LILRB1	LIR-1, ILT2, MIR-7, CD85, LIR1, CD85j	HLA Class I, UL18 [7–11]
		LILRB2	LIR-2, ILT4, MIR-10, LIR2, CD85d, MIR10	HLA Class I, UL18, CD1d [8, 9, 11, 12]
	ITAM adaptor molecules	LILRA1	LIR-6, CD85i, LIR6a	HLA-B27, HLA-C [9, 13]
		LILRA2	LIR-7, ILT1, CD85h, LIR7	Unknown
	Soluble	LILRA3	LIR-4, HM43, ILT6, LIR4, CD85e	HLA-C [9]
Group 2 (<60% similarity to LILRB1/B2; unlikely to bind HLA class I)	ITIM adaptor molecules	LILRB3	LIR-3, HL9, ILT5, LIR3, CD85a	Unknown
		LILRB4	LIR-5, ILT3, HM18, LIR5, CD85k	Unknown
		LILRB5	LIR-8, LIR8, CD85c	Unknown
	ITAM adaptor molecules	LILRA4	ILT7, CD85g	BST-2 [14]
		LILRA5	ILT11, LIR9, CD85, CD85f	Unknown
		LILRA6	ILT8, CD85b	Unknown
pseudogenes		LILRP1	ILT9, CD85l, LILRA6P	n/a
		LILRP2	ILT10, CD85m	n/a