Definition
An sgRNA library, short for "single guide RNA library," is a collection of tens to hundreds of thousands of different sgRNA molecules. Each sgRNA acts like a "molecular key," precisely guiding the CRISPR/Cas9 gene editing system to a specific site on the genome for cutting. Therefore, an sgRNA library is essentially a vast "toolbox" that can target virtually any gene, allowing scientists to simultaneously conduct large-scale functional gene screening across the entire genome.