TABLE 2.

CRISPR diversity in S. thermophilus

Parameter	CRISPR1	CRISPR2	CRISPR3
No. of strains analyzed	124	65	66
No. of strains with locus (%)	124 (100)	59 (90.8)	53 (80.3)
No. of unique arrangements (%)	105 (84.7)	7 (11.9)	20 (37.7)
Avg no. of spacers per locus ± SD	22.9 ± 10.4	2.9 ± 1.1	13.2 ± 5.2
Minimum no. of spacers per locus	2	0	0
Maximum no. of spacers per locus	51	8	29
Total no. of spacers	2,829	173	624
No. of unique spacers (%)	782 (27.6)	16 (9.2)	154 (24.7)