“…For instance, in the Epsilonproteobacterium H. pylori, which has a three-tiered regulatory hierarchy of flagellar expression and assembly, including three sigma factors and a FlgM feedback loop (Niehus et al, 2004), researchers have found that several flagellar structural proteins are involved in flagellar regulation. These proteins include the basal body component FlhA, an essential part of the basal body and the assembly platform (Schmitz et al, 1997;Rust et al, 2009;Minamino et al, 2016a,b;Terahara et al, 2018) as well as FlhF, considered a signal recognition particle (SRP)like protein important for flagellar localization (Bange et al, 2007;Kazmierczak and Hendrixson, 2013;Kondo et al, 2017); additionally the TCSs FlgS-FlgR and ArsS-ArsR are involved (Pflock et al, 2006;Loh et al, 2010;Marcus et al, 2016;Xiong et al, 2019).…”