例句與造句

1. The stages of CRISPR immunity for each of the three major types of adaptive immunity . ( 1 ) Acquisition begins by recognition of invading DNA by Cas1 and Cas2 and cleavage of a protospacer . ( 2 ) The protospacer is ligated to the direct repeat adjacent to the leader sequence and ( 3 ) single strand extension repairs the CRISPR and duplicates the direct repeat.
2. It's difficult to find extension repair in a sentence. 用extension repair造句挺難的