9.So when a DNA virus gets into a host cell, certain fragments of it called Protospacers are incorporated into the host's genome, becoming the spacers in CRISPR locations.
11.What's left are mature crRNAs each made of the complements to both the 3 prime repeat and about 20 nucleotides of a spacer, still bound to tracrRNA.
12.So, when a virus invades a cell, if there is an associated spacer already there, meaning it's on the most-wanted list, the bacterium can go on to destroy the virus.