Growth of E. coli cells carrying pMPMT4Ω with cloned HP1 lytic genes: holin (H), HP1 endolysin (E), or both (HE) with and without induction with arabinose. (A) Viable cells count (CFU/mL). (B) Culture turbidity OD600. Induction of lytic genes expression with arabinose took place after 120 min of growth (black arrow). H-cells carrying hol gene, induced (Hind) or not (Hni) with arabinose. E-cells carrying lys gene, induced (Eind) or not (Eni) with arabinose. HE-cells carrying both lytic genes lys and hol, induced (HEind) or not (HEni) with arabinose. C-control cells carrying empty plasmid, induced (Cind) or not (Cni) with arabinose. Results are representative of three independent experiments.