GO:0003823	F	0.58	antigen binding
GO:0005102	F	0.56	receptor binding
GO:0004872	F	0.30	receptor activity
GO:0050839	F	0.29	cell adhesion molecule binding
GO:0042803	F	0.25	protein homodimerization activity
GO:0034987	F	0.25	immunoglobulin receptor binding
GO:0032403	F	0.17	protein complex binding
GO:0042277	F	0.13	peptide binding
GO:0042605	F	0.12	peptide antigen binding
GO:0004888	F	0.12	transmembrane signaling receptor activity
