What is Cas9 protein that is often mentioned in news?

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CRISPR-Cas9 is a system used by bacterial cells to recognise and destroy viral DNA as a form of adaptive immunity. Using components of the CRISPR system, researchers can remove, add or alter specific DNA sequences in the genome of higher organisms.The gene editing tool has two components:A single-guide RNA (sgRNA) that contains a sequence that can bind to DNA, andThe Cas9 enzyme which acts as a molecular scissor that can cleave DNA.