HeLa is extremely interesting, but still requires humans to cultivate her cells.

Canine transmissible venereal tumor however, is an immortal, contagious dog tumor from a dog thousands of years ago that evolved into its own lifeform - a sexually transmitted parasitic cancer - that has continued to this day to spread from host to host. Yet, genetically, it is still "dog".

Anyway, this is my answer when the job interviewer asks me about long-term goals.