Locus Biosciences’ novel approach to precision antimicrobials works by taking advantage of an immune system present in many bacteria called the CRISPR-Cas system. The CRISPR-Cas system protects bacteria from invaders such as viruses by creating a small strand of RNA called a CRISPR RNA, which matches a DNA sequence specific to a given invader. If the CRISPR RNA is matched to a complementary DNA sequence, the Cas proteins will cleave the invading DNA.