Metabolite number corresponding to the ontology classes in which they belong.
| Metabolite localization | Number of metabolites | Number of subclasses |
|---|---|---|
| Cellular (general class) | ||
| Formative cells | 1 | 1 |
| Subcellular | 140 | 12 |
| Extracellular | ||
| Extracellular | 72 | 0 |
| Human body biofluids | ||
| Amniotic fluid | 1 | 0 |
| Bile | 3 | 0 |
| Biofluid tissues | 376 | 2 |
| Breast milk | 23 | 0 |
| Saliva | 86 | 0 |
| Seminal fluid | 3 | 0 |
| Sweat | 22 | 0 |
| Urine | 188 | 0 |
| Mouth | ||
| Mouth | 1 | 0 |
| Organ | ||
| Bladder | 19 | 0 |
| Brain | 32 | 9 |
| Eye | 2 | 1 |
| Gland | 31 | 3 |
| Heart | 4 | 0 |
| Intestine | 27 | 1 |
| Kidney | 55 | 0 |
| Liver | 50 | 0 |
| Lung | 4 | 0 |
| Muscle | 32 | 3 |
| Pancreas | 16 | 1 |
| Placenta | 26 | 0 |
| Prostate | 49 | 0 |
| Skin | 41 | 1 |
| Spleen | 22 | 0 |
| Spinal cord | ||
| Spinal cord | 5 | 0 |
| Tissue | ||
| Adipose tissue | 24 | 0 |
| All tissues | 15 | 0 |
| Connective tissue | 44 | 2 |
| Hepatic tissue | 14 | 0 |
| Nervous tissue | 32 | 1 |
| Feces | ||
| Feces | 114 | 0 |