A new gene-editing protein, CasX, may give CRISPR-Cas9 a run for its money. UC Berkeley scientists have determined the unique structure of CasX (grey), revealing that this pint-sized Cas enzyme is dominated by RNA (red) that directs it to specific sequences of DNA (blue), where it binds and cuts the DNA.
Scientists find new and smaller CRISPR gene editor: CasX
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