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.
During anaphase, the spindle fibers pull the identical sister chromatids to opposite sides (poles) of the parent cell. The fourth and final step of mitosis is telophase. During telophase, two nuclear envelopes reform around the separated DNA and the DNA de-condenses so that chromosomes are no longer visible. One can also see that the plasma membrane begins to constrict between the newly formed nuclei.