1. Growth of adult mammalian tissue can be prolonged by transference to fresh medium.
2. In a few cases this growth can be continued for ten or eleven generations up to a period of forty days.
3. In the majority of cases growth ceases after three or four generations.
4. After the first transference growth is increased, but in subsequent generations it gradually diminishes and ultimately ceases altogether.
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Copyright, 1914, by The Rockefeller Institute for Medical Research New York
1914
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