JUN and infection: Compared with infection with the WT strain, infection with the LLM deletion strain significantly reduced the mRNA expression of nuclear factor kappa B subunit 1 (NFKB1) (3.37-fold, p < 0.001; Figure 6A) and AP1 or JUN (3.42-fold, p < 0.001; Figure 6B) in the NF-κB and MAPK/AP-1pro-inflammatory signaling pathways.