| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Simple caveola | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Axial filament complex, of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Subunit A of peripheral doublet of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Rootlet of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Central pair of microtubules, cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Dynein arm of peripheral doublet of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Extracellular dense component of desmosome or hemidesmosome | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Cuticle of cell | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Specialized cilium or flagellum | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Cell process | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina, lamina densa component | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina of epithelial cell or tissue | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Specialized subunit or derivative of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Membrane of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal or external lamina of specialized cell or tissue | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Peripheral microtubular doublet of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Subunit B of peripheral doublet or cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina, anchoring filaments | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Micropinocytotic vesicle | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Autodesmosome | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Cilium | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Attachment plaque of desmosome or hemidesmosome | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Rhopheocytotic vesicle | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Discontinuous or incomplete basal or external lamina | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Surface convolutions of cell wall | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina, lamina rara interna component | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Shaft of cilium or flagellum, not bacterial | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal or external lamina of non-epithelial cell or tissue | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina, lamina rara externa component | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Cell adhesion specialization | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Basal lamina, inclusion | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  | 
| Brush border | Is a | True | Cell surface AND/OR associated structure | Inferred relationship | Existential restriction modifier |  |