The cancer cell lines in cancercelllines.org are labeled by their Cellosaurus IDs as the primary identifier. Cell lines are arranged hierarchially: Daughter cell lines are displayed below the primary cell lines they were derived from; i.e. HeLa S3 (CVCL_0058)is shown as a daughter cell line of HeLa (CVCL_0030) and so forth.
Sample selection follows a hierarchical system in which samples matching the child terms of a selected class are included in the response. This means that one can retrieve all instances and daughter cell lines of a given cell line in a id-based search (i.e. searching for HeLa will also return the daughter lines by default - but optionally).