Spindle fibers are protein structures that form early in mitosis, or cell division. They consist of microtubules that originate from the centrioles, two wheel-shaped bodies located in the centromere area of the cell. The centromere is also known as the microtubule organizing center.
1 Night terrors are characterized by frequent recurrent episodes of intense crying and fear during sleep, with difficulty arousing the child. Night terrors are frightening episodes that disrupt family life.  A small percentage of children experience night terrors.
Kids aren't the only ones terrified by night terrors â what parents need to know. The first time your child has a night terror, you'll know â it's much different than your run-of-the-mill nightmare. Even worse, night terrors are totally unpredictable and more likely to affect small children.