| Oxidative phosphorylation |
| Photosynthesis |
| Methane metabolism |
| Nitrogen metabolism |
| Metabolic pathways |
| Cardiac muscle contraction |
| Synaptic vesicle cycle |
| Taste transduction |
| Proximal tubule bicarbonate reclamation |
| Collecting duct acid secretion |
| Salivary secretion |
| Gastric acid secretion |
| Pancreatic secretion |
| Protein digestion and absorption |
| Bile secretion |
| Vitamin digestion and absorption |
| Mineral absorption |
| Vibrio cholerae infection |
| Epithelial cell signaling in Helicobacter pylori infection |
| Influenza A |
| Rheumatoid arthritis |