YqgB encodes adaptive factors that acts in synergy with vqfZ , enabling the bacteria to cope with the physical environment in vivo, facilitating colonisation of the host [1].

1: Characterization of two Bacillus thuringiensis genes identified by in vivo screening of virulence factors. Fedhila S, Guillemet E, Nel P, Lereclus D; Appl Environ Microbiol. 2004;70:4784-4791. PMID:15294815