An adapted method for Cas9-mediated editing reveals the species-specific role of β-glucoside utilization driving competition between Klebsiella species. - Almási ÉdH; Knischewski N; Osbelt L; Muthukumarasamy U; El Mouali Y; Vialetto E; Beisel CL; Strowig T (Journal of bacteriology, 2024)