Fig. 4From: Effect of gut microbiome-derived metabolites and extracellular vesicles on hepatocyte functions in a gut-liver axis chipHepG2 spheroid formation within microwell arrays after 5 and 10 days in a gut-liver axis chip. Light microscopic images of hepG2 spheroids formed in microwell arrays. Spheroid image after cultured in flow and static condition (live and dead cells were stained with green and red, respectively). Scale bars are 50 μmBack to article page