| Abbreviations | Meaning |
 | I-IEL | Intestinal Intraepithelial Lymphocyte |
| BSA | Bowel Sounds Active |
| NABS | Normoactive Bowel Sounds |
| UGI | Upper Gastrointestinal [tract] |
| CIA | Chemiluminescent Immunoassay; Chymotrypsin Inhibitor Activity; Colony-inhibiting Activity; Congenital Intestinal Aganglionosis |
| AGE | Acute Gastroenteritis |
| PGC | Pregastricin; Primordial Germ Cell |
| IPSID | Immunoproliferative Small Intestinal Disease |
| HEI | Human Embryonic Intestine [cells] |
| SIS | Small Intestinal Submucosa (hernia Repair) |
| BO | Bowel Obstruction |
| CIBD | Chronic Inflammatory Bowel Disease |
| FIFR | Fasting Intestinal Flow Rate |
| GIP | Gastric Inhibitory Peptide |
| HHG | Hypertrophic Hypersecretory Gastropathy; Hypogonadotropic Hypogonadism |
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