Morphological features of porcine gut organoids obtained from frozen tissues. Organoids are derived from: A duodenum (7 days, passage 3), B jejunum (7 days, passage 1), C ileum (7 days, passage 3) and D colon (8 days, passage 1). Observation by phase contrast microscopy. Bars: 200 µm. Images are representative of organoids obtained from 4 pigs for each digestive segment.