Stimuli applied generally, not unilaterally, in most cases induce increased divisibility of the cells of the part.
Among stimuli acting unilaterally, perhaps none has proved more interesting, in late times, than what is known as Chemiotaxis.
In the unilaterally explored group, all 19 patients had a solitary adenoma.
Though there are cut-and-dried instances when you should quickly and unilaterally give up on your existing product and iterate, other times will be more ambiguous or complicated.
A stimulus may act on all sides and induce a general effect without direction of movement, but in the production of movement in a definite direction the stimulus must be applied unilaterally.