Control factor of nuclear cycles in cilate conjugation: cell-to-cell transfer in multicellular complexes.

Multicellular complexes of Blepharisma intermedium are regularly produced by treating doublet cells with the gamone of complementary mating type. Cells remain united without undergoing nuclear cycles of conjugation. However, if a cell of complementary mating type unites, nuclear cycles begin at the site of this union and propagate all through the multicellular complex.