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MICRONUCLEUS, the smaller nucleus in Infusoria (q.v.). In fission it divides by mitosis, and in conjugation furnishes the pairing or gametonuclei, by whose reciprocal fusion a zygotenucleus is formed, which gives rise to the meganuclei and micronuclei of the individuals of the next cycle of fission.

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

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