GO:0003823	F	0.79	antigen binding
GO:0042605	F	0.58	peptide antigen binding
GO:0004872	F	0.34	receptor activity
GO:0004871	F	0.31	signal transducer activity
GO:0038023	F	0.30	signaling receptor activity
GO:0044877	F	0.29	macromolecular complex binding
GO:0032403	F	0.28	protein complex binding
GO:0004888	F	0.28	transmembrane signaling receptor activity
GO:0023026	F	0.26	MHC class II protein complex binding
GO:0032395	F	0.24	MHC class II receptor activity
GO:0043167	F	0.13	ion binding
GO:1901363	F	0.12	heterocyclic compound binding
GO:0097159	F	0.12	organic cyclic compound binding
GO:0046872	F	0.12	metal ion binding
GO:0003824	F	0.12	catalytic activity
