Table 1. The clustering results of 10 well-known motif families.

Motif name	Cluster ID	# of true instances	Cluster size	Precision (%)	# of variations
GNAA	HL1	85	87	98	5
GNGA	HL3	45	45	100	14
T-loop	HL4	29	31	94	55(6)
Sarcin-ricin	IL3	47	56	84	18(14)
Kink-turn	IL5	25	39	64	38
Hook-turn	IL6	26	31	84	0
C-loop	IL8	16	21	76	7
E-loop	IL9	16	21	76	7
Tandem shear	IL13	22	30	73	5
Reverse kink-turn	IL21	19	20	95	6

The numbers in the brackets show the variations detected from the datasets not containing the clusters.