Fig. 1
From: CRISPR-Cas gene editing technology and its application prospect in medicinal plants
Schematic representation of CRISPR-Cas9 immunity. Step 1: Acquisition. Insertion of new spacers into the CRISPR locus. Step 2 and 3: Expression and interference. Transcription of CRISPR locus and processing of CRISPR-RNA, then recognition and degradation of foreign elements by the crRNA-Cas9 complex