Primary neuronal precursors in adult crayfish brain: replenishment from a non-neuronal source.

This highly significant increase (ANOVA, p < 0.0001, followed by a Tukey-Kramer HSD) in the total number of niche cells in the absence of an increase in the number of S phase cells, may also suggest that the 1 st -generation neuronal precursor cells in the crayfish niche are not self-renewing because their numbers can increase without additional cell divisions among the niche cells.

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