Abstract
The patterns of increase in numbers of argentophilic elements (kinetosomes) are studied during the cell cycle of Tetrahymena pyriformis, syngen 1. The patterns suggest that new ciliary units are added uniformly to all ciliary rows during the early part of the cell cycle. After the start of the formation of the new oral apparatus, the rate of increase of the row to the right of the oral apparatus is increased and the rate of growth of the row to the left is decreased. The increase in total ciliary units, both somatic and oral, may well be constant for the entire cell cycle.
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