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...l cells from birth. The [[heritability]] of cancers is usually affected by complex interactions between carcinogens and the host's [[genome]]. ...grow in another organism of that species, as long as they share the same [[histocompatibility]] genes,<ref>{{cite web |title= The Nobel Prize in Physiology or Medicine 1

There are four major types of lymphocytes, many sub-types, and hundreds or thousands of lymphocy ...e Burnet speculated that the immune system might one day be found to be as complex as the nervous system. As the production of lymphocytes is so close to the