The resulting semifluid paste—chyme—is sealed in the stomach by two ringlike sphincter muscles for several hours and then released in short bursts into the duodenum. The first of three ...

More information: Yotam Harnik et al, A spatial expression atlas of the adult human proximal small intestine, Nature (2024). DOI: 10.1038/s41586-024-07793-3 Provided by Weizmann Institute of Science ...