Fig. 2From: Using 3D gastrointestinal tract in vitro models with microfold cells and mucus secreting ability to assess the hazard of copper oxide nanomaterialsMucus staining with Alcian Blue. The Caco-2/Raji B (a) and Caco-2/HT29-MTX (b) co-culture models were stained with Alcian blue and imaged with a ZEISS light microscope. The blue colour is mucus stained with Alcian blue. Representative images are shownBack to article page