Bacterial strains and cells
The bacterial strains of E15and Y21 were isolated from kimchi. The bacterial strains of E06and E12 were isolated infant feces samples. All of strains were identified using the method described by Zhang and DuanTo obtain the fermented lysate, bacterial strains were inoculated in fermentation medium (2% molasses, 0.1% peptone, 5% collagen, 0.3% (NHA human keratinocyte cell line, HaCaT cells, purchased from BeNa Culture Collection (Beijing, China), was grown in Dulbecco’s modified essential medium (DMEM; Sigma-Aldrich, USA) supplemented with 10% heat-inactivated fetal bovine serum (FBS; Sigma-Aldrich, USA) and incubated at 37 °C in a 5% CO