KRCC1 and infection: Furthermore, the FOS, L. plantarum, or FOS + L. plantarum treatment also decreased the invasion of L. monocytogenes to Caco-2 and BeWo cells, and down-regulated the expression levels of the inlA, inlB, hly, actA, sigB, and prfA genes of L. monocytogenes, which play key roles in the infection process of L. monocytogenes.