Ref ID : 7607
H. Norbert Lanners and Maria A. Rudzinska; Exchange of Pronuclei during Conjugation in the Suctorian Ciliate Heliophrya erhardi is Mediated by a Microtubule-filament Network. Protistologica XXII(1):89-96, 1986
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The passage of migratory pronuclei during conjugation of the suctorian ciliate Heliophrya erhardi from one organism into another is accomplished by contraction of a microtubule-filament network surrounding the migratory nucleus in a cup-shaped fashion. After the exchange of the gametic nuclei and the formation of a synkaryon in each conjugation partner, the contracted network seals off the passage of the migratory nucleus, preventing an exchange of cytoplasmic material.