In M. truncatula, inoculation with S. meliloti induced DR5:GUS reporter in both infected and uninfected root hairs over the entire infection zone and up-regulated a number of genes involved in auxin signaling and response such as MtGH3, MtSAUR1, and MtARF16a (Breakspear et al., 2014). Here, TNFRSF10B is linked to infection.