Areflex arc is controlled by the neurons within the frontal lobe occipital lobe spinal column brain nerves

spinal column

Explanation:

The reflex arc is the immediate response to the excitement of a nerve, without the will or consciousness of the animal, ie it is a stimulus that does not reach the brain, it receives response in the spinal column.  The path taken by a nervous impulse, which washes the execution of the movement, is the reflex arc. In invertebrates, there are simple reflex arcs involving only one neuron. However, among vertebrates, reflex arcs include at least two neurons.

Briefly, we can state that a reflex arc is controlled by neurons within the spinal column.

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explanation:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.