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MEGANUCLEUS (also called MACRONUCLETJS), in Infusoria (q.ii.)., the large nucleus which undergoes direct (amitotic) division in fission, and is lost during conjugation, to be replaced by a nucleus, the result of the karyogamy of the micronuclei.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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