GO:0015267	F	0.98	channel activity
GO:0015075	F	0.98	ion transmembrane transporter activity
GO:0005262	F	0.97	calcium channel activity
GO:0015279	F	0.96	store-operated calcium channel activity
GO:0036094	F	0.25	small molecule binding
GO:1901363	F	0.19	heterocyclic compound binding
GO:0097159	F	0.19	organic cyclic compound binding
GO:0032555	F	0.16	purine ribonucleotide binding
GO:0001882	F	0.16	nucleoside binding
GO:0035639	F	0.15	purine ribonucleoside triphosphate binding
GO:0032550	F	0.15	purine ribonucleoside binding
GO:0022836	F	0.14	gated channel activity
GO:0032559	F	0.11	adenyl ribonucleotide binding
