n WT4,25,72' 5° in which CRISPR1 was displaced and re- placed with a version containing 51 and 52; V, favass.sis2::pcos5— with cosy inactivated; VI, Wfsesa' sis2::pcos7— with cas7 inactivated. pORI indicates the integrated plasmid (12). The phage sensitivity of each strain to phages 858 and 2972 is repr