Organoid cultures generated from gastrointestinal tissues have been an invaluable advancement for in vitro studies of physiological function and disease. Here we present a comprehensive protocol for the establishment and culture of human- and mouse-derived 3-dimensional gastric organoids transferred to 2-dimensional gastric epithelial cell monolayers. We introduce two methods that include the establishment of monolayers from: (1) intact organoids, and (2) single cells dissociated from intact organoids.
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