| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Heptacarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Hexacarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Tetracarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Pentacarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Dihydroxy bile acid | Is a | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Mono-carboxylic porphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Dicarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Tricarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Octacarboxylporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Turacoporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Deuteroporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Hematoporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Coproporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Protoporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Turacin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Metalloporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Mesoporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Etioporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fecal, qualitative or semi-quantitative | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrins, qualitative measurement, urine | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrins, quantitation and fractionation, urine | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin, quantitative measurement, urine | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, total, plasma | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, 24-hours, feces | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Hemoquant feces | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fractionation, erythrocytes | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin production test | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, feces, quantitative | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, total, erythrocytes | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Urine porphyrin/creatinine ratio measurement | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Blood porphyrin measurement | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Plasma porphyrin measurement | Has measured component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Porphyrin measurement, fecal, qualitative or semi-quantitative | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 3 | 
| Porphyrins, qualitative measurement, urine | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrins, quantitation and fractionation, urine | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Detection of porphyrins | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Porphyrin, quantitative measurement, urine | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin measurement, total, plasma | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin measurement, 24-hours, feces | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 3 | 
| Hemoquant feces | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fractionation, erythrocytes | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Porphyrin production test | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Porphyrin measurement, feces, quantitative | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin measurement, total, erythrocytes | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Urine porphyrin/creatinine ratio measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Blood porphyrin measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Plasma porphyrin measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| 24 hour urine porphyrin output | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Urine total porphyrin level | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| 24 hour urine delta aminolaevulinic acid output | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 4 | 
| Fecal coproporphyrin level | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Blood zinc protoporphyrin level | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Fecal protoporphyrin level | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Porphyrin screening | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Measurement of fractionated porphyrins in plasma specimen | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 3 | 
| Fractionated porphyrin | Is a | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Fractionated porphyrin | Is modification of | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Free erythrocyte protoporphyrin | Is a | True | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| N-methyl coproporphyrin measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin studies | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Pentaporphyrin level | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Measurement of red blood cell porphyrin | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Isocoproporphyrin level | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| 5-aminolaevulinic acid measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 3 | 
| Urine porphyrin profile | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Measurement of isocoproporphyrin content in faeces specimen (procedure) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin abnormality study | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin studies | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Plasma porphyrin screening test | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Measurement of red blood cell porphyrin | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Dicarboxylate porphyrin measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| 5-Aminolaevulinic acid output measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 3 | 
| Porphyrin output measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin/creatinine ratio measurement | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Pentaporphyrin level | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Isocoproporphyrin level | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 2 | 
| Porphyrin/creatinine ratio measurement | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| 5-Aminolaevulinic acid output measurement | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin output measurement | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin abnormality study | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Dicarboxylate porphyrin measurement | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| 5-aminolaevulinic acid measurement | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Measurement of isocoproporphyrin content in faeces specimen (procedure) | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Plasma porphyrin screening test | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Urine porphyrin profile | Component | False | Porphyrin | Inferred relationship | Existential restriction modifier |  | 
| Substance concentration of porphyrin in blood (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Substance concentration of porphyrin in red blood cells (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Substance content of porphyrin in faeces by high performance liquid chromatography (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Substance concentration of porphyrin in urine by high performance liquid chromatography (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Mass concentration of porphyrin in 24 hour urine (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Substance concentration ratio of porphyrin to creatinine in urine (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 | 
| Substance concentration of porphyrin in 24 hour urine (observable entity) | Component | True | Porphyrin | Inferred relationship | Existential restriction modifier | 1 |