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.
Early during prophase, the first stage of mitosis, the chromosomes become visible with a light microscope as they condense (that is, as they shorten, coil, and thicken). Also, a spindle apparatus (blue strands in the upper two figures at left) begins to extend outward from each of the two centrosomes. These starlike configurations, composed of radiating microtubules, are also known as asters â Greek for stars â ().