There are multiple definitions:

1. uracil glycosylase inhibitor(English)

   • prevents mtDNA repair machinery from removing the U
   • mtDNA, TALEN
   • Mitochondrion

2. upper gastrointestial [series](English)

   • series are used to evaluate the anatomy of the esophagus and upper gastrointestinal (GI) tract. This test is useful to exclude disorders that may present in a fashion similar to GER, such as an obstruction due to an esophageal stricture, achalasia causing dysphagia, aspiration during swallowing or a tracheoesophageal fistula causing recurrent pneumonia, or an anatomic disorder causing vomiting, such as pyloric stenosis or a malrotation
   • GERD, GI, GER, UGIS
   • Gastroenterology
   • https://doi.org…86860-2/00336-1