Several studies have assessed Smr15C1 and Smr15C2 expression in S. meliloti 1021 under different biological conditions; i.e. bacterial growth in TY, minimal medium (MM) and luteolin-MM broth and endosymbiotic bacteria (i.e.
The expression of Smr15C1 and Smr15C2 in free-living bacteria was found to be growth-dependent but in an opposite manner.