SIBR-Cas
Multi-Component SwitchSIBR-Cas, termed Self-splicing Intron-Based Riboswitch-Cas, is a multi-component bacterial CRISPR genome engineering system that provides inducible control over CRISPR-Cas counterselection. It is reported to delay counterselection to permit editing events and has been applied to gene knockout in bacteria with poor homologous recombination systems.