Routing Protocol Definition. A routing protocol is a set of rules used by routers to determine the most appropriate paths into which they should forward packets towards their intended destinations.
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.
The animation above illustrates the different phases of mitosis in a plant cell. The following changes occur in the different phases of mitosis. Prophase. In prophase, changes occur in both the cytoplasm and nucleus of the dividing cell. The chromatin condenses into discrete chromosomes. The chromosomes begin to migrate toward the cell center. The nuclear envelope breaks down and spindles form at opposite poles of the cell. In animal cells, the mitotic spindle initially appears as structures called asters which surround each centriole pair.