The effects reported take into account a sequence of events beginning with the interaction of a molecule of a foreign substance with an endogenous molecule. This interaction begins its influence by assuming a form of disturbance at molecular level. When the organism's counteracting capacity is overloaded, the effect can be extended to cellular level. The extreme pressure at this level results in disturbance at tissue and organism levels. Furthermore, this effect can be propagated through the organism as a whole, and finally from the individual to the population.
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