| Type | Location | Extends | Description | 
|---|---|---|---|
| distribution_t | distribution_m | None | |
| input_t | input_m | None | |
| output_t | output_m | None | Encapsulate an input/result pair  | 
               
| subdomain_t | subdomain_m | None | |
| t_cell_collection_bind_C_t | t_cell_collection_m | None | |
| t_cell_collection_t | t_cell_collection_m | None | Encapsulate the state of a collection of T cells  |