Immortalization n. : The act of immortalizing, or state of being immortalized.

Example:
What is the difference between Immortalization and oncogenic transformation?

Taxonomy
ATCC Number, Primary Cells, Clones, Global Bioresource Center, Collections, Yeast, Search Catalog, Vectors, Microbiology, Cell Lines, biological research, media products, search, Animal Viruses, Bacteria, Hybridomas, Deposits, Fungi.

Defination from the web:
ATCC is a global nonprofit bioresource center (BRC) and research organization that provides biological products, technical services and educational programs to private industry, government and academic organizations.