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The two loci contained highly conserved and identical direct repeat sequences which were stable in their RNA secondary structure. Additionally, 2564 total spacers including 980 unique spacers arranged in 59 alleles were identified. Homology analysis showed only 1.8% (18/98 of the spacers matched with plasmid or phage. CRISPR polymorphism present in human isolates and frog isolates was more closely related and more extensive than that of fish isolates based on spacer polymorphism. The elucidation of the structural characteristics of th