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 first phase of mitosis is prophase. During this phase the nucleus disappears. Once the nucleus has disappeared, the centrioles move from the center of the cell to different ends of it. Fibers cross and form the mitotic spindle. Once the fibers have extended and centrioles have separated, prometaphase begins.